Move extensions to gen_blog.py

I forgot that the blog is fully rendered in the feed too.

scripts/gen_blog.py

@@ -4,10 +4,11 @@ import os
 import sys
 import markdown
 from template import template, escape_braces
+from pymdownx.superfences import SuperFencesCodeExtension
 
 def gen_list(files, ext, limit=-1, mini=False):
 	from template import template
-	md = markdown.Markdown(extensions = ["meta", "extra"])
+	md = markdown.Markdown(extensions = ["meta", "extra", "toc", SuperFencesCodeExtension(preserve_tabs=True)])
 	items = ""
 	i = 0
 	for post in files: