Cleanup redundant bits

assets/stylesheets/pages/_mkdocs.scss

@@ -1,4 +1,4 @@
-%mkdocs {
+._mkdocs {
   h2 { @extend %block-heading; }
   h3 { @extend %block-label, %label-blue; }
   h4 { @extend %block-label; }
@@ -9,7 +9,3 @@
 
   p > code, li > code { @extend %label; }
 }
-
-._mkdocs {
-  @extend %mkdocs;
-}

lib/docs/filters/mkdocs/clean_html.rb

@@ -4,7 +4,6 @@ module Docs
       def call
         css('.toclink').each do |node|
           node.parent.content = node.content
-          node.remove
         end
 
         css('pre').each do |node|

lib/docs/filters/rest_framework/clean_html.rb

@@ -4,17 +4,11 @@ module Docs
       def call
         css('hr').remove
 
-        css('.badges').each do |node|
-          node.remove
-        end
+        css('.badges').remove
 
-        css('pre').each do |node|
-          node['data-language'] = 'python'
-        end
+        css('pre').attr('data-language', 'python')
 
-        css('h1').each do |node|
-          node['style'] = nil
-        end
+        css('h1').attr('style', nil)
 
         # Translate source files links to DevDocs links
         links = Nokogiri::XML::Node.new('p', doc)
@@ -23,7 +17,6 @@ module Docs
         css('a.github').each do |node|
           span = node.at_css('span')
           node.content = span.content
-          span.remove
           node['class'] = '_links-link'
           links.add_child(node)
         end