diff --git a/Gemfile b/Gemfile
index 3be9c3c..feb1cd1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,2 +1,5 @@
 source "https://rubygems.org"
 gemspec
+group :jekyll_plugins do
+    gem "jekyll-katex"
+end
\ No newline at end of file
diff --git a/_config.yml b/_config.yml
index 1dacecc..7a045dd 100644
--- a/_config.yml
+++ b/_config.yml
@@ -81,7 +81,7 @@ nav_sort: case_sensitive # Capital letters sorted before lowercase
 back_to_top: true
 back_to_top_text: "Lên đầu trang"
 
-footer_content: "@Quang Thắng"
+footer_content: "Sống như một đóa hoa!"
 
 # Footer last edited timestamp
 last_edit_timestamp: true # show or hide edit time - page must have `last_modified_date` defined in the frontmatter
@@ -104,8 +104,15 @@ color_scheme: nil
 
 cf_tracking: a3bc8207481e41caad5cb16558187c6b
 
+# Katex
+katex:
+  rendering_options:
+    throw_error: true
+    error_color: "#cc0000"
+
 plugins:
   - jekyll-seo-tag
+  - jekyll-katex
 
 kramdown:
   syntax_highlighter_opts:
diff --git a/_includes/head.html b/_includes/head.html
index c0f73d7..3ecdae9 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -14,18 +14,6 @@
 
   <link rel="stylesheet" href="{{ '/assets/css/just-the-docs-default.css' | relative_url }}">
 
-  {% if site.ga_tracking != nil %}
-    <script async src="https://www.googletagmanager.com/gtag/js?id={{ site.ga_tracking }}"></script>
-    <script>
-      window.dataLayer = window.dataLayer || [];
-      function gtag(){dataLayer.push(arguments);}
-      gtag('js', new Date());
-
-      gtag('config', '{{ site.ga_tracking }}'{% unless site.ga_tracking_anonymize_ip == nil %}, { 'anonymize_ip': true }{% endunless %});
-    </script>
-
-  {% endif %}
-
   {% if site.search_enabled != false %}
     <script type="text/javascript" src="{{ '/assets/js/vendor/lunr.min.js' | relative_url }}"></script>
   {% endif %}
diff --git a/_includes/head_custom.html b/_includes/head_custom.html
index e69de29..c76d1e6 100644
--- a/_includes/head_custom.html
+++ b/_includes/head_custom.html
@@ -0,0 +1 @@
+<link href="/assets/css/katex.min.css" rel="stylesheet">
\ No newline at end of file
diff --git a/_layouts/default.html b/_layouts/default.html
index fc3ce92..0d33082 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -15,7 +15,7 @@ layout: table_wrappers
       </svg>
     </symbol>
     <symbol id="svg-search" viewBox="0 0 24 24">
-      <title>Search</title>
+      <title>Tìm kiếm</title>
       <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-search">
         <circle cx="11" cy="11" r="8"></circle><line x1="21" y1="21" x2="16.65" y2="16.65"></line>
       </svg>
@@ -27,13 +27,13 @@ layout: table_wrappers
       </svg>
     </symbol>
     <symbol id="svg-arrow-right" viewBox="0 0 24 24">
-      <title>Expand</title>
+      <title>Mở rộng</title>
       <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-chevron-right">
         <polyline points="9 18 15 12 9 6"></polyline>
       </svg>
     </symbol>
     <symbol id="svg-doc" viewBox="0 0 24 24">
-      <title>Document</title>
+      <title>Tài liệu</title>
       <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-file">
         <path d="M13 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V9z"></path><polyline points="13 2 13 9 20 9"></polyline>
       </svg>
@@ -74,7 +74,7 @@ layout: table_wrappers
       {% if site.search_enabled != false %}
         <div class="search">
           <div class="search-input-wrap">
-            <input type="text" id="search-input" class="search-input" tabindex="0" placeholder="Search {{ site.title }}" aria-label="Search {{ site.title }}" autocomplete="off">
+            <input type="text" id="search-input" class="search-input" tabindex="0" placeholder="Tìm kiếm {{ site.title }}" aria-label="Search {{ site.title }}" autocomplete="off">
             <label for="search-input" class="search-label"><svg viewBox="0 0 24 24" class="search-icon"><use xlink:href="#svg-search"></use></svg></label>
           </div>
           <div id="search-results" class="search-results"></div>
@@ -139,7 +139,7 @@ layout: table_wrappers
 
         {% if page.has_children == true and page.has_toc != false %}
           <hr>
-          <h2 class="text-delta">Table of contents</h2>
+          <h2 class="text-delta">Mục lục</h2>
           <ul>
             {%- assign children_list = pages_list | where: "parent", page.title | where: "grand_parent", page.parent -%}
             {% for child in children_list %}
diff --git a/assets/css/katex.min.css b/assets/css/katex.min.css
new file mode 100644
index 0000000..98b7c7b
--- /dev/null
+++ b/assets/css/katex.min.css
@@ -0,0 +1 @@
+@font-face{font-family:KaTeX_AMS;src:url(fonts/KaTeX_AMS-Regular.woff2) format("woff2"),url(fonts/KaTeX_AMS-Regular.woff) format("woff"),url(fonts/KaTeX_AMS-Regular.ttf) format("truetype");font-weight:400;font-style:normal}@font-face{font-family:KaTeX_Caligraphic;src:url(fonts/KaTeX_Caligraphic-Bold.woff2) format("woff2"),url(fonts/KaTeX_Caligraphic-Bold.woff) format("woff"),url(fonts/KaTeX_Caligraphic-Bold.ttf) format("truetype");font-weight:700;font-style:normal}@font-face{font-family:KaTeX_Caligraphic;src:url(fonts/KaTeX_Caligraphic-Regular.woff2) format("woff2"),url(fonts/KaTeX_Caligraphic-Regular.woff) format("woff"),url(fonts/KaTeX_Caligraphic-Regular.ttf) format("truetype");font-weight:400;font-style:normal}@font-face{font-family:KaTeX_Fraktur;src:url(fonts/KaTeX_Fraktur-Bold.woff2) format("woff2"),url(fonts/KaTeX_Fraktur-Bold.woff) format("woff"),url(fonts/KaTeX_Fraktur-Bold.ttf) format("truetype");font-weight:700;font-style:normal}@font-face{font-family:KaTeX_Fraktur;src:url(fonts/KaTeX_Fraktur-Regular.woff2) format("woff2"),url(fonts/KaTeX_Fraktur-Regular.woff) format("woff"),url(fonts/KaTeX_Fraktur-Regular.ttf) format("truetype");font-weight:400;font-style:normal}@font-face{font-family:KaTeX_Main;src:url(fonts/KaTeX_Main-Bold.woff2) format("woff2"),url(fonts/KaTeX_Main-Bold.woff) format("woff"),url(fonts/KaTeX_Main-Bold.ttf) format("truetype");font-weight:700;font-style:normal}@font-face{font-family:KaTeX_Main;src:url(fonts/KaTeX_Main-BoldItalic.woff2) format("woff2"),url(fonts/KaTeX_Main-BoldItalic.woff) format("woff"),url(fonts/KaTeX_Main-BoldItalic.ttf) format("truetype");font-weight:700;font-style:italic}@font-face{font-family:KaTeX_Main;src:url(fonts/KaTeX_Main-Italic.woff2) format("woff2"),url(fonts/KaTeX_Main-Italic.woff) format("woff"),url(fonts/KaTeX_Main-Italic.ttf) format("truetype");font-weight:400;font-style:italic}@font-face{font-family:KaTeX_Main;src:url(fonts/KaTeX_Main-Regular.woff2) format("woff2"),url(fonts/KaTeX_Main-Regular.woff) format("woff"),url(fonts/KaTeX_Main-Regular.ttf) format("truetype");font-weight:400;font-style:normal}@font-face{font-family:KaTeX_Math;src:url(fonts/KaTeX_Math-BoldItalic.woff2) format("woff2"),url(fonts/KaTeX_Math-BoldItalic.woff) format("woff"),url(fonts/KaTeX_Math-BoldItalic.ttf) format("truetype");font-weight:700;font-style:italic}@font-face{font-family:KaTeX_Math;src:url(fonts/KaTeX_Math-Italic.woff2) format("woff2"),url(fonts/KaTeX_Math-Italic.woff) format("woff"),url(fonts/KaTeX_Math-Italic.ttf) format("truetype");font-weight:400;font-style:italic}@font-face{font-family:"KaTeX_SansSerif";src:url(fonts/KaTeX_SansSerif-Bold.woff2) format("woff2"),url(fonts/KaTeX_SansSerif-Bold.woff) format("woff"),url(fonts/KaTeX_SansSerif-Bold.ttf) 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n=this.fetch();if(-1!==t.endOfExpression.indexOf(n.text))break;if(r&&n.text===r)break;if(e&&ia[n.text]&&ia[n.text].infix)break;var i=this.parseAtom(r);if(!i)break;"internal"!==i.type&&a.push(i)}return"text"===this.mode&&this.formLigatures(a),this.handleInfixNodes(a)},e.handleInfixNodes=function(t){for(var e,r=-1,a=0;a<t.length;a++)if("infix"===t[a].type){if(-1!==r)throw new o("only one infix operator per group",t[a].token);r=a,e=t[a].replaceWith}if(-1!==r&&e){var n,i,s=t.slice(0,r),l=t.slice(r+1);return n=1===s.length&&"ordgroup"===s[0].type?s[0]:{type:"ordgroup",mode:this.mode,body:s},i=1===l.length&&"ordgroup"===l[0].type?l[0]:{type:"ordgroup",mode:this.mode,body:l},["\\\\abovefrac"===e?this.callFunction(e,[n,t[r],i],[]):this.callFunction(e,[n,i],[])]}return t},e.handleSupSubscript=function(e){var r=this.fetch(),a=r.text;this.consume();var n=this.parseGroup(e,!1,t.SUPSUB_GREEDINESS,void 0,void 0,!0);if(!n)throw new o("Expected group after '"+a+"'",r);return n},e.formatUnsupportedCmd=function(t){for(var e=[],r=0;r<t.length;r++)e.push({type:"textord",mode:"text",text:t[r]});var a={type:"text",mode:this.mode,body:e};return{type:"color",mode:this.mode,color:this.settings.errorColor,body:[a]}},e.parseAtom=function(t){var e,r,a=this.parseGroup("atom",!1,null,t);if("text"===this.mode)return a;for(;;){this.consumeSpaces();var n=this.fetch();if("\\limits"===n.text||"\\nolimits"===n.text){if(a&&"op"===a.type){var i="\\limits"===n.text;a.limits=i,a.alwaysHandleSupSub=!0}else{if(!a||"operatorname"!==a.type||!a.alwaysHandleSupSub)throw new o("Limit controls must follow a math operator",n);var s="\\limits"===n.text;a.limits=s}this.consume()}else if("^"===n.text){if(e)throw new o("Double superscript",n);e=this.handleSupSubscript("superscript")}else if("_"===n.text){if(r)throw new o("Double subscript",n);r=this.handleSupSubscript("subscript")}else{if("'"!==n.text)break;if(e)throw new o("Double superscript",n);var l={type:"textord",mode:this.mode,text:"\\prime"},h=[l];for(this.consume();"'"===this.fetch().text;)h.push(l),this.consume();"^"===this.fetch().text&&h.push(this.handleSupSubscript("superscript")),e={type:"ordgroup",mode:this.mode,body:h}}}return e||r?{type:"supsub",mode:this.mode,base:a,sup:e,sub:r}:a},e.parseFunction=function(t,e,r){var a=this.fetch(),n=a.text,i=ia[n];if(!i)return null;if(this.consume(),null!=r&&i.greediness<=r)throw new o("Got function '"+n+"' with no arguments"+(e?" as "+e:""),a);if("text"===this.mode&&!i.allowedInText)throw new o("Can't use function '"+n+"' in text mode",a);if("math"===this.mode&&!1===i.allowedInMath)throw new o("Can't use function '"+n+"' in math mode",a);var s=this.parseArguments(n,i),l=s.args,h=s.optArgs;return this.callFunction(n,l,h,a,t)},e.callFunction=function(t,e,r,a,n){var i={funcName:t,parser:this,token:a,breakOnTokenText:n},s=ia[t];if(s&&s.handler)return s.handler(i,e,r);throw new o("No function handler for "+t)},e.parseArguments=function(t,e){var r=e.numArgs+e.numOptionalArgs;if(0===r)return{args:[],optArgs:[]};for(var a=e.greediness,n=[],i=[],s=0;s<r;s++){var l=e.argTypes&&e.argTypes[s],h=s<e.numOptionalArgs,m=s>0&&!h||0===s&&!h&&"math"===this.mode,c=this.parseGroupOfType("argument to '"+t+"'",l,h,a,m);if(!c){if(h){i.push(null);continue}throw new o("Expected group after '"+t+"'",this.fetch())}(h?i:n).push(c)}return{args:n,optArgs:i}},e.parseGroupOfType=function(t,e,r,a,n){switch(e){case"color":return n&&this.consumeSpaces(),this.parseColorGroup(r);case"size":return n&&this.consumeSpaces(),this.parseSizeGroup(r);case"url":return this.parseUrlGroup(r,n);case"math":case"text":return this.parseGroup(t,r,a,void 0,e,n);case"hbox":var i=this.parseGroup(t,r,a,void 0,"text",n);return i?{type:"styling",mode:i.mode,body:[i],style:"text"}:i;case"raw":if(n&&this.consumeSpaces(),r&&"{"===this.fetch().text)return null;var s=this.parseStringGroup("raw",r,!0);if(s)return{type:"raw",mode:"text",string:s.text};throw new o("Expected raw group",this.fetch());case"original":case null:case void 0:return this.parseGroup(t,r,a,void 0,void 0,n);default:throw new o("Unknown group type as "+t,this.fetch())}},e.consumeSpaces=function(){for(;" "===this.fetch().text;)this.consume()},e.parseStringGroup=function(t,e,r){var a=e?"[":"{",n=e?"]":"}",i=this.fetch();if(i.text!==a){if(e)return null;if(r&&"EOF"!==i.text&&/[^{}[\]]/.test(i.text))return this.consume(),i}var s=this.mode;this.mode="text",this.expect(a);for(var l,h="",m=this.fetch(),c=0,u=m;(l=this.fetch()).text!==n||r&&c>0;){switch(l.text){case"EOF":throw new o("Unexpected end of input in "+t,m.range(u,h));case a:c++;break;case n:c--}h+=(u=l).text,this.consume()}return this.expect(n),this.mode=s,m.range(u,h)},e.parseRegexGroup=function(t,e){var r=this.mode;this.mode="text";for(var a,n=this.fetch(),i=n,s="";"EOF"!==(a=this.fetch()).text&&t.test(s+a.text);)s+=(i=a).text,this.consume();if(""===s)throw new o("Invalid "+e+": '"+n.text+"'",n);return this.mode=r,n.range(i,s)},e.parseColorGroup=function(t){var e=this.parseStringGroup("color",t);if(!e)return null;var r=/^(#[a-f0-9]{3}|#?[a-f0-9]{6}|[a-z]+)$/i.exec(e.text);if(!r)throw new o("Invalid color: '"+e.text+"'",e);var a=r[0];return/^[0-9a-f]{6}$/i.test(a)&&(a="#"+a),{type:"color-token",mode:this.mode,color:a}},e.parseSizeGroup=function(t){var e,r=!1;if(!(e=t||"{"===this.fetch().text?this.parseStringGroup("size",t):this.parseRegexGroup(/^[-+]? *(?:$|\d+|\d+\.\d*|\.\d*) *[a-z]{0,2} *$/,"size")))return null;t||0!==e.text.length||(e.text="0pt",r=!0);var a=/([-+]?) *(\d+(?:\.\d*)?|\.\d+) *([a-z]{2})/.exec(e.text);if(!a)throw new o("Invalid size: '"+e.text+"'",e);var n={number:+(a[1]+a[2]),unit:a[3]};if(!At(n))throw new o("Invalid unit: '"+n.unit+"'",e);return{type:"size",mode:this.mode,value:n,isBlank:r}},e.parseUrlGroup=function(t,e){this.gullet.lexer.setCatcode("%",13);var r=this.parseStringGroup("url",t,!0);if(this.gullet.lexer.setCatcode("%",14),!r)return null;var a=r.text.replace(/\\([#$%&~_^{}])/g,"$1");return{type:"url",mode:this.mode,url:a}},e.parseGroup=function(e,r,n,i,s,l){var h=this.mode;s&&this.switchMode(s),l&&this.consumeSpaces();var m,c=this.fetch(),u=c.text;if(r?"["===u:"{"===u||"\\begingroup"===u){this.consume();var p=t.endOfGroup[u];this.gullet.beginGroup();var d=this.parseExpression(!1,p),f=this.fetch();this.expect(p),this.gullet.endGroup(),m={type:"ordgroup",mode:this.mode,loc:a.range(c,f),body:d,semisimple:"\\begingroup"===u||void 0}}else if(r)m=null;else if(null==(m=this.parseFunction(i,e,n)||this.parseSymbol())&&"\\"===u[0]&&!ba.hasOwnProperty(u)){if(this.settings.throwOnError)throw new o("Undefined control sequence: "+u,c);m=this.formatUnsupportedCmd(u),this.consume()}return s&&this.switchMode(h),m},e.formLigatures=function(t){for(var e=t.length-1,r=0;r<e;++r){var n=t[r],i=n.text;"-"===i&&"-"===t[r+1].text&&(r+1<e&&"-"===t[r+2].text?(t.splice(r,3,{type:"textord",mode:"text",loc:a.range(n,t[r+2]),text:"---"}),e-=2):(t.splice(r,2,{type:"textord",mode:"text",loc:a.range(n,t[r+1]),text:"--"}),e-=1)),"'"!==i&&"`"!==i||t[r+1].text!==i||(t.splice(r,2,{type:"textord",mode:"text",loc:a.range(n,t[r+1]),text:i+i}),e-=1)}},e.parseSymbol=function(){var t=this.fetch(),e=t.text;if(/^\\verb[^a-zA-Z]/.test(e)){this.consume();var r=e.slice(5),n="*"===r.charAt(0);if(n&&(r=r.slice(1)),r.length<2||r.charAt(0)!==r.slice(-1))throw new o("\\verb assertion failed --\n                    please report what input caused this bug");return{type:"verb",mode:"text",body:r=r.slice(1,-1),star:n}}ka.hasOwnProperty(e[0])&&!j[this.mode][e[0]]&&(this.settings.strict&&"math"===this.mode&&this.settings.reportNonstrict("unicodeTextInMathMode",'Accented Unicode text character "'+e[0]+'" used in math mode',t),e=ka[e[0]]+e.substr(1));var i,s=sa.exec(e);if(s&&("i"===(e=e.substring(0,s.index))?e="\u0131":"j"===e&&(e="\u0237")),j[this.mode][e]){this.settings.strict&&"math"===this.mode&&"\xc7\xd0\xde\xe7\xfe".indexOf(e)>=0&&this.settings.reportNonstrict("unicodeTextInMathMode",'Latin-1/Unicode text character "'+e[0]+'" used in math mode',t);var l,h=j[this.mode][e].group,m=a.range(t);if(W.hasOwnProperty(h)){var c=h;l={type:"atom",mode:this.mode,family:c,loc:m,text:e}}else l={type:h,mode:this.mode,loc:m,text:e};i=l}else{if(!(e.charCodeAt(0)>=128))return null;this.settings.strict&&(M(e.charCodeAt(0))?"math"===this.mode&&this.settings.reportNonstrict("unicodeTextInMathMode",'Unicode text character "'+e[0]+'" used in math mode',t):this.settings.reportNonstrict("unknownSymbol",'Unrecognized Unicode character "'+e[0]+'" ('+e.charCodeAt(0)+")",t)),i={type:"textord",mode:"text",loc:a.range(t),text:e}}if(this.consume(),s)for(var u=0;u<s[0].length;u++){var p=s[0][u];if(!wa[p])throw new o("Unknown accent ' "+p+"'",t);var d=wa[p][this.mode];if(!d)throw new o("Accent "+p+" unsupported in "+this.mode+" mode",t);i={type:"accent",mode:this.mode,loc:a.range(t),label:d,isStretchy:!1,isShifty:!0,base:i}}return i},t}();Sa.endOfExpression=["}","\\endgroup","\\end","\\right","&"],Sa.endOfGroup={"[":"]","{":"}","\\begingroup":"\\endgroup"},Sa.SUPSUB_GREEDINESS=1;var Ma=function(t,e){if(!("string"==typeof t||t instanceof String))throw new TypeError("KaTeX can only parse string typed expression");var r=new Sa(t,e);delete r.gullet.macros.current["\\df@tag"];var a=r.parse();if(r.gullet.macros.get("\\df@tag")){if(!e.displayMode)throw new o("\\tag works only in display equations");r.gullet.feed("\\df@tag"),a=[{type:"tag",mode:"text",body:a,tag:r.parse()}]}return a},za=function(t,e,r){e.textContent="";var a=Ta(t,r).toNode();e.appendChild(a)};"undefined"!=typeof document&&"CSS1Compat"!==document.compatMode&&("undefined"!=typeof console&&console.warn("Warning: KaTeX doesn't work in quirks mode. Make sure your website has a suitable doctype."),za=function(){throw new o("KaTeX doesn't work in quirks mode.")});var Aa=function(t,e,r){if(r.throwOnError||!(t instanceof o))throw t;var a=Dt.makeSpan(["katex-error"],[new E(e)]);return a.setAttribute("title",t.toString()),a.setAttribute("style","color:"+r.errorColor),a},Ta=function(t,e){var r=new u(e);try{var a=Ma(t,r);return ke(a,t,r)}catch(e){return Aa(e,t,r)}},Ba={version:"0.12.0",render:za,renderToString:function(t,e){return Ta(t,e).toMarkup()},ParseError:o,__parse:function(t,e){var r=new u(e);return Ma(t,r)},__renderToDomTree:Ta,__renderToHTMLTree:function(t,e){var r=new u(e);try{return function(t,e,r){var a=le(t,ye(r)),n=Dt.makeSpan(["katex"],[a]);return we(n,r)}(Ma(t,r),0,r)}catch(e){return Aa(e,t,r)}},__setFontMetrics:function(t,e){F[t]=e},__defineSymbol:$,__defineMacro:pa,__domTree:{Span:N,Anchor:I,SymbolNode:E,SvgNode:L,PathNode:P,LineNode:D}};e.default=Ba}]).default});
\ No newline at end of file
diff --git a/docs/tests/index.md b/docs/tests/index.md
deleted file mode 100644
index 27fc4d7..0000000
--- a/docs/tests/index.md
+++ /dev/null
@@ -1,22 +0,0 @@
----
-layout: default
-title: Tests
-has_children: true
-nav_order: 100
----
-
-# Tests
-
- The main documentation pages of this theme illustrate the use of many of its features, which to some extent tests their implementation. The pages linked below provide further test cases for particular features, and may be useful for regression testing when developing new features.
- 
-The default configuration does not include the test pages. To include them, *commment-out* the following line in `_config.yml`:
-
-```yaml
-, "docs/tests/"
-```
-so that it is:
-```yaml
-# , "docs/tests/"
-```
-
-(Apparently Jekyll's `include` does *not* override `exclude`  for the same folder...)
diff --git a/docs/tests/navigation/disambiguation/a.md b/docs/tests/navigation/disambiguation/a.md
deleted file mode 100644
index b680fe6..0000000
--- a/docs/tests/navigation/disambiguation/a.md
+++ /dev/null
@@ -1,14 +0,0 @@
----
-layout: default
-title: Tests for disambiguation A
-has_children: true
----
-
-# A
-
-A top-level page
-
-```yaml
-title: Tests for disambiguation A
-has_children: true
-```
diff --git a/docs/tests/navigation/disambiguation/b.md b/docs/tests/navigation/disambiguation/b.md
deleted file mode 100644
index 23403e8..0000000
--- a/docs/tests/navigation/disambiguation/b.md
+++ /dev/null
@@ -1,14 +0,0 @@
----
-layout: default
-title: Tests for disambiguation B
-has_children: true
----
-
-# B
-
-A top-level page
-
-```yaml
-title: Tests for disambiguation B
-has_children: true
-```
diff --git a/docs/tests/navigation/disambiguation/ca.md b/docs/tests/navigation/disambiguation/ca.md
deleted file mode 100644
index e645044..0000000
--- a/docs/tests/navigation/disambiguation/ca.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: Tests for disambiguation C
-parent: Tests for disambiguation A
-has_children: true
----
-
-# C
-
-A child of page A, and parent of page D
-
-```yaml
-title: Tests for disambiguation C
-parent: Tests for disambiguation A
-has_children: true
-```
diff --git a/docs/tests/navigation/disambiguation/cb.md b/docs/tests/navigation/disambiguation/cb.md
deleted file mode 100644
index d15844f..0000000
--- a/docs/tests/navigation/disambiguation/cb.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: Tests for disambiguation C
-parent: Tests for disambiguation B
-has_children: true
----
-
-# C
-
-A child of page B, and parent of page D
-
-```yaml
-title: Tests for disambiguation C
-parent: Tests for disambiguation B
-has_children: true
-```
diff --git a/docs/tests/navigation/disambiguation/dca.md b/docs/tests/navigation/disambiguation/dca.md
deleted file mode 100644
index c01dbbb..0000000
--- a/docs/tests/navigation/disambiguation/dca.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: Tests for disambiguation D
-parent: Tests for disambiguation C
-grand_parent: Tests for disambiguation A
----
-
-# D
-
-A grandchild of page A
-
-```yaml
-title: Tests for disambiguation D
-parent: Tests for disambiguation C
-grand_parent: Tests for disambiguation A
-```
diff --git a/docs/tests/navigation/disambiguation/dcb.md b/docs/tests/navigation/disambiguation/dcb.md
deleted file mode 100644
index f80d83d..0000000
--- a/docs/tests/navigation/disambiguation/dcb.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: Tests for disambiguation D
-parent: Tests for disambiguation C
-grand_parent: Tests for disambiguation B
----
-
-# D
-
-A grandchild of page B
-
-```yaml
-title: Tests for disambiguation D
-parent: Tests for disambiguation C
-grand_parent: Tests for disambiguation B
-```
diff --git a/docs/tests/navigation/disambiguation/index.md b/docs/tests/navigation/disambiguation/index.md
deleted file mode 100644
index 3d8f799..0000000
--- a/docs/tests/navigation/disambiguation/index.md
+++ /dev/null
@@ -1,14 +0,0 @@
----
-layout: default
-title: Disambiguation 
-parent: Navigation
-grand_parent: Tests
----
-
-# Disambiguation
-
-When different pages with children have the same title, referencing the relevant grandparent in the children disambiguates which page is intended.
-
-- [Page A](a/) has a child [page with title C](ca/), and a grandchild [page with title D](dca/).
-- [Page B](b/) has a child [page with title C](cb/), and a grandchild [page with title D](dcb/).
-- The grandchild pages specify their parent and grandparent pages, so there is no ambiguity.
diff --git a/docs/tests/navigation/exclusion/0.md b/docs/tests/navigation/exclusion/0.md
deleted file mode 100644
index 96634dd..0000000
--- a/docs/tests/navigation/exclusion/0.md
+++ /dev/null
@@ -1,13 +0,0 @@
----
-layout: default
-title: Tests for exclusion 0
-has_children: true
-nav_exclude: true
----
-# Tests for exclusion 0
-
-```yaml
-title: Tests for exclusion 0
-has_children: true
-nav_exclude: true
-```
diff --git a/docs/tests/navigation/exclusion/00.md b/docs/tests/navigation/exclusion/00.md
deleted file mode 100644
index 44aadd1..0000000
--- a/docs/tests/navigation/exclusion/00.md
+++ /dev/null
@@ -1,15 +0,0 @@
----
-layout: default
-title: Tests for exclusion 00
-parent: Tests for exclusion 0
-has_children: true
-nav_exclude: true
----
-# Tests for exclusion 00
-
-```yaml
-title: Tests for exclusion 00
-parent: Tests for exclusion 0
-has_children: true
-nav_exclude: true
-```
diff --git a/docs/tests/navigation/exclusion/000.md b/docs/tests/navigation/exclusion/000.md
deleted file mode 100644
index 5846671..0000000
--- a/docs/tests/navigation/exclusion/000.md
+++ /dev/null
@@ -1,17 +0,0 @@
----
-layout: default
-title: Tests for exclusion 000
-parent: Tests for exclusion 00
-grand_parent: Tests for exclusion 0
-has_children: false
-nav_exclude: true
----
-# Tests for exclusion 000
-
-```yaml
-title: Tests for exclusion 000
-parent: Tests for exclusion 00
-grand_parent: Tests for exclusion 0
-has_children: false
-nav_exclude: true
-```
diff --git a/docs/tests/navigation/exclusion/001.md b/docs/tests/navigation/exclusion/001.md
deleted file mode 100644
index 3afe961..0000000
--- a/docs/tests/navigation/exclusion/001.md
+++ /dev/null
@@ -1,17 +0,0 @@
----
-layout: default
-title: Tests for exclusion 001
-parent: Tests for exclusion 00
-grand_parent: Tests for exclusion 0
-has_children: false
-nav_exclude: false
----
-# Tests for exclusion 001
-
-```yaml
-title: Tests for exclusion 001
-parent: Tests for exclusion 00
-grand_parent: Tests for exclusion 0
-has_children: false
-nav_exclude: false
-```
diff --git a/docs/tests/navigation/exclusion/01.md b/docs/tests/navigation/exclusion/01.md
deleted file mode 100644
index 0855b2c..0000000
--- a/docs/tests/navigation/exclusion/01.md
+++ /dev/null
@@ -1,15 +0,0 @@
----
-layout: default
-title: Tests for exclusion 01
-parent: Tests for exclusion 0
-has_children: true
-nav_exclude: false
----
-# Tests for exclusion 01
-
-```yaml
-title: Tests for exclusion 01
-parent: Tests for exclusion 0
-has_children: true
-nav_exclude: false
-```
diff --git a/docs/tests/navigation/exclusion/010.md b/docs/tests/navigation/exclusion/010.md
deleted file mode 100644
index c9944ed..0000000
--- a/docs/tests/navigation/exclusion/010.md
+++ /dev/null
@@ -1,17 +0,0 @@
----
-layout: default
-title: Tests for exclusion 010
-parent: Tests for exclusion 01
-grand_parent: Tests for exclusion 0
-has_children: false
-nav_exclude: true
----
-# Tests for exclusion 010
-
-```yaml
-title: Tests for exclusion 010
-parent: Tests for exclusion 01
-grand_parent: Tests for exclusion 0
-has_children: false
-nav_exclude: true
-```
diff --git a/docs/tests/navigation/exclusion/011.md b/docs/tests/navigation/exclusion/011.md
deleted file mode 100644
index f8359b4..0000000
--- a/docs/tests/navigation/exclusion/011.md
+++ /dev/null
@@ -1,17 +0,0 @@
----
-layout: default
-title: Tests for exclusion 011
-parent: Tests for exclusion 01
-grand_parent: Tests for exclusion 0
-has_children: false
-nav_exclude: false
----
-# Tests for exclusion 011
-
-```yaml
-title: Tests for exclusion 011
-parent: Tests for exclusion 01
-grand_parent: Tests for exclusion 0
-has_children: false
-nav_exclude: false
-```
diff --git a/docs/tests/navigation/exclusion/1.md b/docs/tests/navigation/exclusion/1.md
deleted file mode 100644
index 0b6bff8..0000000
--- a/docs/tests/navigation/exclusion/1.md
+++ /dev/null
@@ -1,13 +0,0 @@
----
-layout: default
-title: Tests for exclusion 1
-has_children: true
-nav_exclude: false
----
-# Tests for exclusion 1
-
-```yaml
-title: Tests for exclusion 1
-has_children: true
-nav_exclude: false
-```
diff --git a/docs/tests/navigation/exclusion/10.md b/docs/tests/navigation/exclusion/10.md
deleted file mode 100644
index 624d115..0000000
--- a/docs/tests/navigation/exclusion/10.md
+++ /dev/null
@@ -1,15 +0,0 @@
----
-layout: default
-title: Tests for exclusion 10
-parent: Tests for exclusion 1
-has_children: true
-nav_exclude: true
----
-# Tests for exclusion 10
-
-```yaml
-title: Tests for exclusion 10
-parent: Tests for exclusion 1
-has_children: true
-nav_exclude: true
-```
diff --git a/docs/tests/navigation/exclusion/100.md b/docs/tests/navigation/exclusion/100.md
deleted file mode 100644
index 89a8090..0000000
--- a/docs/tests/navigation/exclusion/100.md
+++ /dev/null
@@ -1,17 +0,0 @@
----
-layout: default
-title: Tests for exclusion 100
-parent: Tests for exclusion 10
-grand_parent: Tests for exclusion 1
-has_children: false
-nav_exclude: true
----
-# Tests for exclusion 100
-
-```yaml
-title: Tests for exclusion 100
-parent: Tests for exclusion 10
-grand_parent: Tests for exclusion 1
-has_children: false
-nav_exclude: true
-```
diff --git a/docs/tests/navigation/exclusion/101.md b/docs/tests/navigation/exclusion/101.md
deleted file mode 100644
index 240dac7..0000000
--- a/docs/tests/navigation/exclusion/101.md
+++ /dev/null
@@ -1,17 +0,0 @@
----
-layout: default
-title: Tests for exclusion 101
-parent: Tests for exclusion 10
-grand_parent: Tests for exclusion 1
-has_children: false
-nav_exclude: false
----
-# Tests for exclusion 101
-
-```yaml
-title: Tests for exclusion 101
-parent: Tests for exclusion 10
-grand_parent: Tests for exclusion 1
-has_children: false
-nav_exclude: false
-```
diff --git a/docs/tests/navigation/exclusion/11.md b/docs/tests/navigation/exclusion/11.md
deleted file mode 100644
index 04cef63..0000000
--- a/docs/tests/navigation/exclusion/11.md
+++ /dev/null
@@ -1,15 +0,0 @@
----
-layout: default
-title: Tests for exclusion 11
-parent: Tests for exclusion 1
-has_children: true
-nav_exclude: false
----
-# Tests for exclusion 11
-
-```yaml
-title: Tests for exclusion 11
-parent: Tests for exclusion 1
-has_children: true
-nav_exclude: false
-```
diff --git a/docs/tests/navigation/exclusion/110.md b/docs/tests/navigation/exclusion/110.md
deleted file mode 100644
index 7c24237..0000000
--- a/docs/tests/navigation/exclusion/110.md
+++ /dev/null
@@ -1,17 +0,0 @@
----
-layout: default
-title: Tests for exclusion 110
-parent: Tests for exclusion 11
-grand_parent: Tests for exclusion 1
-has_children: false
-nav_exclude: true
----
-# Tests for exclusion 110
-
-```yaml
-title: Tests for exclusion 110
-parent: Tests for exclusion 11
-grand_parent: Tests for exclusion 1
-has_children: false
-nav_exclude: true
-```
diff --git a/docs/tests/navigation/exclusion/111.md b/docs/tests/navigation/exclusion/111.md
deleted file mode 100644
index 230b55b..0000000
--- a/docs/tests/navigation/exclusion/111.md
+++ /dev/null
@@ -1,17 +0,0 @@
----
-layout: default
-title: Tests for exclusion 111
-parent: Tests for exclusion 11
-grand_parent: Tests for exclusion 1
-has_children: false
-nav_exclude: false
----
-# Tests for exclusion 111
-
-```yaml
-title: Tests for exclusion 111
-parent: Tests for exclusion 11
-grand_parent: Tests for exclusion 1
-has_children: false
-nav_exclude: false
-```
diff --git a/docs/tests/navigation/exclusion/excluded.md b/docs/tests/navigation/exclusion/excluded.md
deleted file mode 100644
index 5f67d2b..0000000
--- a/docs/tests/navigation/exclusion/excluded.md
+++ /dev/null
@@ -1,11 +0,0 @@
----
-layout: default
-nav_exclude: true
----
-# Tests for exclusion untitled and excluded
-
-This page does not have a `title`, and it is explicitly excluded from the navigation
-
-```yaml
-nav_exclude: true
-```
diff --git a/docs/tests/navigation/exclusion/index.md b/docs/tests/navigation/exclusion/index.md
deleted file mode 100644
index b7d4a3b..0000000
--- a/docs/tests/navigation/exclusion/index.md
+++ /dev/null
@@ -1,36 +0,0 @@
----
-layout: default
-title: Exclusion
-parent: Navigation
-grand_parent: Tests
----
-
-# Exclusion
-
-Pages excluded from the main navigation can have parents and children. Navigation to and between excluded pages can be supported by the auto-generating list of child pages inserted at the bottom of each page, and by links to parents in the breadcrumbs at the top of each page.
-
-The following tests cover all combinations of excluded and included pages for the top level, child pages, and grandchild pages. The last binary digit in a page title indicates whether the page is included (1) or excluded (0); preceding digits refer to its parent and grandparent.
-
-## Included in main navigation
-
-- [Tests for exclusion 1](1/)
-- [Tests for exclusion 11](11/)
-- [Tests for exclusion 111](111/)
-
-## Included only in child navigation
-
-- [Tests for exclusion 110](110/)
-- [Tests for exclusion 10](10/)
-- [Tests for exclusion 101](101/)
-- [Tests for exclusion 100](100/)
-- [Tests for exclusion 01](01/)
-- [Tests for exclusion 011](011/)
-- [Tests for exclusion 010](010/)
-- [Tests for exclusion 00](00/)
-- [Tests for exclusion 001](001/)
-- [Tests for exclusion 000](000/)
-
-## Not included in main or child navigation
-
-- [Tests for exclusion 0](0/)
-- ["Untitled"](untitled/)
diff --git a/docs/tests/navigation/exclusion/untitled.md b/docs/tests/navigation/exclusion/untitled.md
deleted file mode 100644
index 4d8b4b4..0000000
--- a/docs/tests/navigation/exclusion/untitled.md
+++ /dev/null
@@ -1,6 +0,0 @@
----
-layout: default
----
-# Tests for exclusion untitled
-
-This page does not have a `title`, and it is excluded from the navigation -- unless it is located in a Jekyll collection (which provides default titles). To exclude a title-less page from the navigation, regardless of whether it is located in a collection, set `nav_exclude: true`.
diff --git a/docs/tests/navigation/index.md b/docs/tests/navigation/index.md
deleted file mode 100644
index 90c6711..0000000
--- a/docs/tests/navigation/index.md
+++ /dev/null
@@ -1,8 +0,0 @@
----
-layout: default
-title: Navigation
-parent: Tests
-has_children: true
----
-
-# Navigation
diff --git a/docs/tests/navigation/order/default/10.md b/docs/tests/navigation/order/default/10.md
deleted file mode 100644
index 7e1d82a..0000000
--- a/docs/tests/navigation/order/default/10.md
+++ /dev/null
@@ -1,14 +0,0 @@
----
-layout: default
-title: "10"
-parent: Default
-grand_parent: Tests for order
----
-
-# 10
-
-```yaml
-title: "10"
-parent: Default
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/default/2.md b/docs/tests/navigation/order/default/2.md
deleted file mode 100644
index 158f49a..0000000
--- a/docs/tests/navigation/order/default/2.md
+++ /dev/null
@@ -1,14 +0,0 @@
----
-layout: default
-title: "2"
-parent: Default
-grand_parent: Tests for order
----
-
-# 2
-
-```yaml
-title: "2"
-parent: Default
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/default/a.md b/docs/tests/navigation/order/default/a.md
deleted file mode 100644
index bd7e347..0000000
--- a/docs/tests/navigation/order/default/a.md
+++ /dev/null
@@ -1,14 +0,0 @@
----
-layout: default
-title: A
-parent: Default
-grand_parent: Tests for order
----
-
-# A
-
-```yaml
-title: A
-parent: Default
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/default/aa-lower.md b/docs/tests/navigation/order/default/aa-lower.md
deleted file mode 100644
index 295ed08..0000000
--- a/docs/tests/navigation/order/default/aa-lower.md
+++ /dev/null
@@ -1,14 +0,0 @@
----
-layout: default
-title: aa
-parent: Default
-grand_parent: Tests for order
----
-
-# aa
-
-```yaml
-title: aa
-parent: Default
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/default/aa.md b/docs/tests/navigation/order/default/aa.md
deleted file mode 100644
index f100030..0000000
--- a/docs/tests/navigation/order/default/aa.md
+++ /dev/null
@@ -1,14 +0,0 @@
----
-layout: default
-title: Aa
-parent: Default
-grand_parent: Tests for order
----
-
-# Aa
-
-```yaml
-title: Aa
-parent: Default
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/default/index.md b/docs/tests/navigation/order/default/index.md
deleted file mode 100644
index c276bb3..0000000
--- a/docs/tests/navigation/order/default/index.md
+++ /dev/null
@@ -1,15 +0,0 @@
----
-layout: default
-title: Default
-parent: Tests for order
-nav_order: 1
-has_children: true
----
-
-# Default Order
-
-When `nav_order` fields are omitted, the pages are ordered alphabetically by their titles.
-
-By default, all Capital letters come before all lowercase letters; you can add `nav_sort: case_insensitive` in the configuration file to ignore the case).
-
-Digits precede letters, and numeric titles are ordered lexicographically: `10` precedes `2` (in contrast to explicit numeric `nav_order` values).
diff --git a/docs/tests/navigation/order/floats/-1.1.md b/docs/tests/navigation/order/floats/-1.1.md
deleted file mode 100644
index ee040c8..0000000
--- a/docs/tests/navigation/order/floats/-1.1.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "-1.1"
-nav_order: -1.1
-parent: Floats
-grand_parent: Tests for order
----
-
-# -1.1
-
-```yaml
-title: "-1.1"
-nav_order: -1.1
-parent: Floats
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/floats/0.0.md b/docs/tests/navigation/order/floats/0.0.md
deleted file mode 100644
index f5e516d..0000000
--- a/docs/tests/navigation/order/floats/0.0.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "0.0"
-nav_order: 0.0
-parent: Floats
-grand_parent: Tests for order
----
-
-# 0.0
-
-```yaml
-title: "0.0"
-nav_order: 0.0
-parent: Floats
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/floats/10.0.md b/docs/tests/navigation/order/floats/10.0.md
deleted file mode 100644
index 797f81d..0000000
--- a/docs/tests/navigation/order/floats/10.0.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "10.0"
-nav_order: 10.0
-parent: Floats
-grand_parent: Tests for order
----
-
-# 10.0
-
-```yaml
-title: "10.0"
-nav_order: 10.0
-parent: Floats
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/floats/2.2222.md b/docs/tests/navigation/order/floats/2.2222.md
deleted file mode 100644
index 8910946..0000000
--- a/docs/tests/navigation/order/floats/2.2222.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "2.2222"
-nav_order: 2.2222
-parent: Floats
-grand_parent: Tests for order
----
-
-# 2.2222
-
-```yaml
-title: "2.2222"
-nav_order: 2.2222
-parent: Floats
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/floats/index.md b/docs/tests/navigation/order/floats/index.md
deleted file mode 100644
index 2846629..0000000
--- a/docs/tests/navigation/order/floats/index.md
+++ /dev/null
@@ -1,13 +0,0 @@
----
-layout: default
-title: Floats
-parent: Tests for order
-nav_order: 4
-has_children: true
----
-
-# Floating-Point Order
-
-When `nav_order` fields are floating-point numbers, the pages are ordered in increasing order of the numerical values.
-
-Floats include `0.0` and negative values. 
diff --git a/docs/tests/navigation/order/index.md b/docs/tests/navigation/order/index.md
deleted file mode 100644
index 9dbff4a..0000000
--- a/docs/tests/navigation/order/index.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: Order
-parent: Navigation
-grand_parent: Tests
----
-
-# Order
-
-The value of `nav_order` can be numbers (integers, floats) and/or strings. The following tests illustrate their effects.
-
-- [Default](default/), using `title` instead of `nav_order` fields.
-- [Strings](strings/), lexicographically ordered, possibly case-insensitively.
-- [Integers](integers/), numerically ordered.
-- [Floats](floats/), numerically ordered.
-- [Mixture](mixture/), with numbers before strings.
diff --git a/docs/tests/navigation/order/integers/-1.md b/docs/tests/navigation/order/integers/-1.md
deleted file mode 100644
index 8b1444e..0000000
--- a/docs/tests/navigation/order/integers/-1.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "-1"
-nav_order: -1
-parent: Integers
-grand_parent: Tests for order
----
-
-# -1
-
-```yaml
-title: "-1"
-nav_order: -1
-parent: Integers
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/integers/0.md b/docs/tests/navigation/order/integers/0.md
deleted file mode 100644
index 21b1327..0000000
--- a/docs/tests/navigation/order/integers/0.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "0"
-nav_order: 0
-parent: Integers
-grand_parent: Tests for order
----
-
-# 0
-
-```yaml
-title: "0"
-nav_order: 0
-parent: Integers
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/integers/10.md b/docs/tests/navigation/order/integers/10.md
deleted file mode 100644
index 4157151..0000000
--- a/docs/tests/navigation/order/integers/10.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "10"
-nav_order: 10
-parent: Integers
-grand_parent: Tests for order
----
-
-# 10
-
-```yaml
-title: "10"
-nav_order: 10
-parent: Integers
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/integers/2.md b/docs/tests/navigation/order/integers/2.md
deleted file mode 100644
index 2ebb1ca..0000000
--- a/docs/tests/navigation/order/integers/2.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "2"
-nav_order: 2
-parent: Integers
-grand_parent: Tests for order
----
-
-# 2
-
-```yaml
-title: "2"
-nav_order: 2
-parent: Integers
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/integers/index.md b/docs/tests/navigation/order/integers/index.md
deleted file mode 100644
index 077cdc5..0000000
--- a/docs/tests/navigation/order/integers/index.md
+++ /dev/null
@@ -1,13 +0,0 @@
----
-layout: default
-title: Integers
-parent: Tests for order
-nav_order: 3
-has_children: true
----
-
-# Integer Order
-
-When `nav_order` fields are integers, the pages are ordered in increasing order of the numerical values.
-
-Integers include `0` and negative values. Integers can be reused for top-level pages and for different sets of child pages. 
diff --git a/docs/tests/navigation/order/mixture/-1.1.md b/docs/tests/navigation/order/mixture/-1.1.md
deleted file mode 100644
index 668d642..0000000
--- a/docs/tests/navigation/order/mixture/-1.1.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "-1.1"
-nav_order: -1.1
-parent: Mixture
-grand_parent: Tests for order
----
-
-# -1.1
-
-```yaml
-title: "-1.1"
-nav_order: -1.1
-parent: Mixture
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/mixture/-1.md b/docs/tests/navigation/order/mixture/-1.md
deleted file mode 100644
index e1c5a12..0000000
--- a/docs/tests/navigation/order/mixture/-1.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "-1"
-nav_order: -1
-parent: Mixture
-grand_parent: Tests for order
----
-
-# -1
-
-```yaml
-title: "-1"
-nav_order: -1
-parent: Mixture
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/mixture/0.0.md b/docs/tests/navigation/order/mixture/0.0.md
deleted file mode 100644
index a2006d8..0000000
--- a/docs/tests/navigation/order/mixture/0.0.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "0.0"
-nav_order: 0.0
-parent: Mixture
-grand_parent: Tests for order
----
-
-# 0.0
-
-```yaml
-title: "0.0"
-nav_order: 0.0
-parent: Mixture
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/mixture/0.md b/docs/tests/navigation/order/mixture/0.md
deleted file mode 100644
index 14f137f..0000000
--- a/docs/tests/navigation/order/mixture/0.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "0"
-nav_order: 0
-parent: Mixture
-grand_parent: Tests for order
----
-
-# 0
-
-```yaml
-title: "0"
-nav_order: 0
-parent: Mixture
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/mixture/10.0.md b/docs/tests/navigation/order/mixture/10.0.md
deleted file mode 100644
index 70308a6..0000000
--- a/docs/tests/navigation/order/mixture/10.0.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "10.0"
-nav_order: 10.0
-parent: Mixture
-grand_parent: Tests for order
----
-
-# 10.0
-
-```yaml
-title: "10.0"
-nav_order: 10.0
-parent: Mixture
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/mixture/10.md b/docs/tests/navigation/order/mixture/10.md
deleted file mode 100644
index 542ae3f..0000000
--- a/docs/tests/navigation/order/mixture/10.md
+++ /dev/null
@@ -1,14 +0,0 @@
----
-layout: default
-title: "10"
-parent: Mixture
-grand_parent: Tests for order
----
-
-# 10
-
-```yaml
-title: "10"
-parent: Mixture
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/mixture/2.2222.md b/docs/tests/navigation/order/mixture/2.2222.md
deleted file mode 100644
index 2520d51..0000000
--- a/docs/tests/navigation/order/mixture/2.2222.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "2.2222"
-nav_order: 2.2222
-parent: Mixture
-grand_parent: Tests for order
----
-
-# 2.2222
-
-```yaml
-title: "2.2222"
-nav_order: 2.2222
-parent: Mixture
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/mixture/2.md b/docs/tests/navigation/order/mixture/2.md
deleted file mode 100644
index 2ae4553..0000000
--- a/docs/tests/navigation/order/mixture/2.md
+++ /dev/null
@@ -1,14 +0,0 @@
----
-layout: default
-title: "2"
-parent: Mixture
-grand_parent: Tests for order
----
-
-# 2
-
-```yaml
-title: "2"
-parent: Mixture
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/mixture/a.md b/docs/tests/navigation/order/mixture/a.md
deleted file mode 100644
index 342b05f..0000000
--- a/docs/tests/navigation/order/mixture/a.md
+++ /dev/null
@@ -1,14 +0,0 @@
----
-layout: default
-title: A
-parent: Mixture
-grand_parent: Tests for order
----
-
-# A
-
-```yaml
-title: A
-parent: Mixture
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/mixture/aa-lower.md b/docs/tests/navigation/order/mixture/aa-lower.md
deleted file mode 100644
index 2d63985..0000000
--- a/docs/tests/navigation/order/mixture/aa-lower.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: aa
-nav_order: "aa"
-parent: Mixture
-grand_parent: Tests for order
----
-
-# aa
-
-```yaml
-title: aa
-nav_order: "aa"
-parent: Mixture
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/mixture/aa.md b/docs/tests/navigation/order/mixture/aa.md
deleted file mode 100644
index 69cf05f..0000000
--- a/docs/tests/navigation/order/mixture/aa.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: Aa
-nav_order: "Aa"
-parent: Mixture
-grand_parent: Tests for order
----
-
-# Aa
-
-```yaml
-title: Aa
-nav_order: "Aa"
-parent: Mixture
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/mixture/index.md b/docs/tests/navigation/order/mixture/index.md
deleted file mode 100644
index 24317b2..0000000
--- a/docs/tests/navigation/order/mixture/index.md
+++ /dev/null
@@ -1,11 +0,0 @@
----
-layout: default
-title: Mixture
-parent: Tests for order
-nav_order: 5
-has_children: true
----
-
-# Mixed Order
-
-It seems unlikely that different types of `nav_order` values are needed for the children of the same parent.
diff --git a/docs/tests/navigation/order/order.md b/docs/tests/navigation/order/order.md
deleted file mode 100644
index 2d8cebf..0000000
--- a/docs/tests/navigation/order/order.md
+++ /dev/null
@@ -1,7 +0,0 @@
----
-layout: default
-title: Tests for order
-has_children: true
----
-
-# Order
diff --git a/docs/tests/navigation/order/strings/10.md b/docs/tests/navigation/order/strings/10.md
deleted file mode 100644
index 6c3e480..0000000
--- a/docs/tests/navigation/order/strings/10.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "10"
-nav_order: "10"
-parent: Strings
-grand_parent: Tests for order
----
-
-# 10
-
-```yaml
-title: "10"
-nav_order: "10"
-parent: Strings
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/strings/2.md b/docs/tests/navigation/order/strings/2.md
deleted file mode 100644
index 0c96c32..0000000
--- a/docs/tests/navigation/order/strings/2.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: "2"
-nav_order: "2"
-parent: Strings
-grand_parent: Tests for order
----
-
-# 2
-
-```yaml
-title: "2"
-nav_order: "2"
-parent: Strings
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/strings/a.md b/docs/tests/navigation/order/strings/a.md
deleted file mode 100644
index ac1f3bd..0000000
--- a/docs/tests/navigation/order/strings/a.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: A
-nav_order: A
-parent: Strings
-grand_parent: Tests for order
----
-
-# A
-
-```yaml
-title: A
-nav_order: A
-parent: Strings
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/strings/aa-lower.md b/docs/tests/navigation/order/strings/aa-lower.md
deleted file mode 100644
index 0cbb0b2..0000000
--- a/docs/tests/navigation/order/strings/aa-lower.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: aa
-nav_order: "aa"
-parent: Strings
-grand_parent: Tests for order
----
-
-# aa
-
-```yaml
-title: aa
-nav_order: "aa"
-parent: Strings
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/strings/aa.md b/docs/tests/navigation/order/strings/aa.md
deleted file mode 100644
index 6eaf7a2..0000000
--- a/docs/tests/navigation/order/strings/aa.md
+++ /dev/null
@@ -1,16 +0,0 @@
----
-layout: default
-title: Aa
-nav_order: "Aa"
-parent: Strings
-grand_parent: Tests for order
----
-
-# Aa
-
-```yaml
-title: Aa
-nav_order: "Aa"
-parent: Strings
-grand_parent: Tests for order
-```
diff --git a/docs/tests/navigation/order/strings/index.md b/docs/tests/navigation/order/strings/index.md
deleted file mode 100644
index 404e3a8..0000000
--- a/docs/tests/navigation/order/strings/index.md
+++ /dev/null
@@ -1,13 +0,0 @@
----
-layout: default
-title: Strings
-parent: Tests for order
-nav_order: 2
-has_children: true
----
-
-# String Order
-
-By default, all Capital letters come before all lowercase letters; you can add `nav_sort: case_insensitive` in the configuration file to ignore the case).
-
-Digits precede letters, and numeric titles are ordered lexicographically: `"10"` precedes `"2"` (in contrast to explicit numeric `nav_order` values).
diff --git a/docs/tests/styling/dl.md b/docs/tests/styling/dl.md
deleted file mode 100644
index 49dc034..0000000
--- a/docs/tests/styling/dl.md
+++ /dev/null
@@ -1,83 +0,0 @@
----
-layout: default
-title: Description lists
-parent: Styling
-grand_parent: Tests
----
-
-# Description lists
-
-The first child element of each `dd` element in a `dl` list should be aligned with the preceding `dt` element in the following examples.
-
-term
-
-: paragraph text
-
-  paragraph text
-
-term
-
-: ### Header
-
-  paragraph text
-
-term
-
-: > block quote
-
-  paragraph text
-
-term
-
-: ```sh
-  fenced code block
-  ```
-
-  paragraph text
-
-term
-
-: + unordered list item
-  + unordered list item
-
-  paragraph text
-
-term
-
-: 1. ordered list item
-  2. ordered list item
-
-  paragraph text
-
-term
-
-: sub-term
-  : sub-description
-  
-  sub-term
-  : sub-description
-
-  paragraph text
-
-term
-
-: |-----------------+------------+-----------------+----------------|
-  | Default aligned |Left aligned| Center aligned  | Right aligned  |
-  |-----------------|:-----------|:---------------:|---------------:|
-  | First body part |Second cell | Third cell      | fourth cell    |
-  | Second line     |foo         | **strong**      | baz            |
-  | Third line      |quux        | baz             | bar            |
-  |-----------------+------------+-----------------+----------------|
-  | Second body     |            |                 |                |
-  | 2 line          |            |                 |                |
-  |=================+============+=================+================|
-  | Footer row      |            |                 |                |
-  |-----------------+------------+-----------------+----------------|
-
-  paragraph text
-
-term
-
-: ***
-
-  paragraph text
diff --git a/docs/tests/styling/index.md b/docs/tests/styling/index.md
deleted file mode 100644
index 12782be..0000000
--- a/docs/tests/styling/index.md
+++ /dev/null
@@ -1,8 +0,0 @@
----
-layout: default
-title: Styling
-parent: Tests
-has_children: true
----
-
-# Styling
diff --git a/docs/tests/styling/ol.md b/docs/tests/styling/ol.md
deleted file mode 100644
index 6e1468d..0000000
--- a/docs/tests/styling/ol.md
+++ /dev/null
@@ -1,65 +0,0 @@
----
-layout: default
-title: Ordered lists
-parent: Styling
-grand_parent: Tests
----
-
-# Ordered lists
-
-The first child element of each `li` element in an `ol` list should be aligned with the preceding label in the following examples.
-
-1.  paragraph text
-
-    paragraph text
-
-1.  ### Header
-
-    paragraph text
-
-1.  > block quote
-
-    paragraph text
-
-1.  ```sh
-    fenced code block
-    ```
-
-    paragraph text
-
-1.  + unordered list item
-    + unordered list item
-
-    paragraph text
-
-1.  1. ordered list item
-    2. ordered list item
-
-    paragraph text
-
-1.  term
-    : description
-  
-    term
-    : description
-
-    paragraph text
-
-1.  |-----------------+------------+-----------------+----------------|
-    | Default aligned |Left aligned| Center aligned  | Right aligned  |
-    |-----------------|:-----------|:---------------:|---------------:|
-    | First body part |Second cell | Third cell      | fourth cell    |
-    | Second line     |foo         | **strong**      | baz            |
-    | Third line      |quux        | baz             | bar            |
-    |-----------------+------------+-----------------+----------------|
-    | Second body     |            |                 |                |
-    | 2 line          |            |                 |                |
-    |=================+============+=================+================|
-    | Footer row      |            |                 |                |
-    |-----------------+------------+-----------------+----------------|
-
-    paragraph text
-
-1.  ***
-
-    paragraph text
diff --git a/docs/tests/styling/ul.md b/docs/tests/styling/ul.md
deleted file mode 100644
index 070b41a..0000000
--- a/docs/tests/styling/ul.md
+++ /dev/null
@@ -1,65 +0,0 @@
----
-layout: default
-title: Unordered lists
-parent: Styling
-grand_parent: Tests
----
-
-# Unordered lists
-
-The first child element of each `li` element in a `ul` list should be aligned with the preceding bullet in the following examples.
-
-- paragraph text
-
-  paragraph text
-
-- ### Header
-
-  paragraph text
-
-- > block quote
-
-  paragraph text
-
-- ```sh
-  fenced code block
-  ```
-
-  paragraph text
-
-- + unordered list item
-  + unordered list item
-
-  paragraph text
-
-- 1. ordered list item
-  2. ordered list item
-
-  paragraph text
-
-- term
-  : description
-  
-  term
-  : description
-
-  paragraph text
-
-- |-----------------+------------+-----------------+----------------|
-  | Default aligned |Left aligned| Center aligned  | Right aligned  |
-  |-----------------|:-----------|:---------------:|---------------:|
-  | First body part |Second cell | Third cell      | fourth cell    |
-  | Second line     |foo         | **strong**      | baz            |
-  | Third line      |quux        | baz             | bar            |
-  |-----------------+------------+-----------------+----------------|
-  | Second body     |            |                 |                |
-  | 2 line          |            |                 |                |
-  |=================+============+=================+================|
-  | Footer row      |            |                 |                |
-  |-----------------+------------+-----------------+----------------|
-
-  paragraph text
-
-- ***
-
-  paragraph text
diff --git a/docs/vat-li/lop-10/chuyen-dong-thang-deu.md b/docs/vat-li/lop-10/chuyen-dong-thang-deu.md
index fda538c..5df65e5 100644
--- a/docs/vat-li/lop-10/chuyen-dong-thang-deu.md
+++ b/docs/vat-li/lop-10/chuyen-dong-thang-deu.md
@@ -2,20 +2,13 @@
 layout: default
 title: Chuyển động thẳng đều
 parent: Vật lí 10
+grand_parent: Vật lí 
 ---
-<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.12.0/dist/katex.min.css" integrity="sha384-AfEj0r4/OFrOo5t7NnNe46zW/tFgW6x/bCJG8FqQCEo3+Aro6EYUG4+cU+KJWu/X" crossorigin="anonymous">
 
 # Khái niệm
 > Chuyển động thẳng đều là chuyển động có quỹ đạo là một đường thẳng và có vận tốc không đổi.
 
 # Tốc độ trung bình
-<div class="tex" data-expr="\KaTeX">\frac{2}{3}</div>
-<div class="example tex" data-expr="\displaystyle \left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right)"></div>
-       
-<script defer src="https://cdn.jsdelivr.net/npm/katex@0.12.0/dist/katex.min.js" integrity="sha384-g7c+Jr9ZivxKLnZTDUhnkOnsh30B4H0rpLUpJ4jAIKs4fnJI+sEnkvrMWph2EDg4" crossorigin="anonymous"></script>
-
-<!-- To automatically render math in text elements, include the auto-render extension: -->
-<script defer src="https://cdn.jsdelivr.net/npm/katex@0.12.0/dist/contrib/auto-render.min.js" integrity="sha384-mll67QQFJfxn0IYznZYonOWZ644AWYC+Pt2cHqMaRhXVrursRwvLnLaebdGIlYNa" crossorigin="anonymous"
-        onload="renderMathInElement(document.body);"></script>
-<div class="example tex" data-expr="\displaystyle {1 +  \frac{q^2}{(1-q)}+\frac{q^6}{(1-q)(1-q^2)}+\cdots }= \prod_{j=0}^{\infty}\frac{1}{(1-q^{5j+2})(1-q^{5j+3})}, \quad\quad \text{for }\lvert q\rvert<1."></div>
- 
+{% katex display %}
+V_{tb} = \frac{s}{t}
+{% endkatex %}
\ No newline at end of file
diff --git a/docs/vat-li/lop-10/lop-10.md b/docs/vat-li/lop-10/lop-10.md
index e4a54f1..82224d9 100644
--- a/docs/vat-li/lop-10/lop-10.md
+++ b/docs/vat-li/lop-10/lop-10.md
@@ -1,8 +1,6 @@
 ---
 layout: default
 title: Vật lí 10
-has_children: true
-nav_order: 1
 parent: Vật lí
-permalink: vat-li/lop-10
+has_children: true
 ---
\ No newline at end of file
diff --git a/just-the-docs.gemspec b/just-the-docs.gemspec
index 21414bd..05a3a6f 100644
--- a/just-the-docs.gemspec
+++ b/just-the-docs.gemspec
@@ -17,5 +17,4 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "jekyll", ">= 3.8.5"
   spec.add_runtime_dependency "jekyll-seo-tag", "~> 2.0"
   spec.add_runtime_dependency "rake", ">= 12.3.1", "< 13.1.0"
-
 end