Revert "Optional delay of grandchildren link display"

This reverts commit 8ac545a5eb.

_config.yml

@@ -27,9 +27,6 @@ search_enabled: true
 # Enable or disable heading anchors
 heading_anchors: true
 
-# Restrict display of grandchildren to selected parent when true:
-grandchildren_branch: false
-
 # Aux links for the upper right navigation
 aux_links:
   "Just the Docs on GitHub":

_includes/nav.html

@@ -20,7 +20,6 @@
                     {%- endif -%}
                     <a href="{{ child.url | absolute_url }}" class="navigation-list-link{% if page.url == child.url %} active{% endif %}">{{ child.title }}</a>
                     {%- if child.has_children -%}
-                    {%- if page.url == child.url or page.parent == child.title or site.grandchildren_branch != true -%}
                         {%- assign grand_children_list = site.html_pages | where: "parent", child.title | sort:"nav_order" -%}
                         <ul class="navigation-list-child-list">
                         {%- for grand_child in grand_children_list -%}
@@ -30,7 +29,6 @@
                         {%- endfor -%}
                       </ul>
                     {%- endif -%}
-                    {%- endif -%}
                   </li>
                 {%- endfor -%}
               </ul>

docs/navigation-structure.md

@@ -191,20 +191,6 @@ This would create the following navigation structure:
 +-- ..
 ```
 
-The current default is that when a grandparent is selected, the links to its
-children *and all its grandchildren* are displayed in the navigation menu.
-So in the above example, selecting `UI Components` displays the link to
-`Button Child Page` as well as the link to `Buttons`.
-
-Setting the following global option in `_config.yml` delays the display of links
-to grandchildren until their parent is selected. So selecting `UI Components`
-displays only the link to `Buttons`, and the link to `Button Child Page` is
-displayed when `Buttons` is selected.
-
-```
-grandchildren_branch: true
-```
-
 ---
 
 ## Auxiliary Navigation