⚒ Fixed header issues

source/dart-sass.html.haml

@@ -26,7 +26,7 @@ introduction: >
       See `sass --help` for additional information on the command-line
       interface.
 
-      #### Dart Library
+      ### Dart Library
 
       You can also use Dart Sass as a Dart library to get the speed of the Dart
       VM plus the ability to define your own functions and importers. To add it

source/libsass.html.haml

@@ -171,7 +171,7 @@ introduction: >
   = image_tag 'logos/libsass.png', alt: 'LibSass logo'
 
 - content_for :navigation do
-  %h3 Wrappers
+  %h2 Wrappers
 
   .sl-c-list-navigation-wrapper
     :markdown
@@ -190,7 +190,7 @@ introduction: >
       - [Scala](#scala)
 
 - content_for :complementary do
-  %h3 Resources
+  %h2 Resources
 
   %ul
     - for project in data.libsass.resources

source/ruby-sass.html.haml

@@ -9,7 +9,7 @@ introduction: >
 %ul.list-columns
   %li
     :markdown
-      ### But Why?
+      ## But Why?
 
       When Natalie and Hampton first created Sass in 2006, Ruby was the language
       at the cutting edge of web development, the basis of their
@@ -32,7 +32,7 @@ introduction: >
 
   %li
     :markdown
-      ### Migrating Away
+      ## Migrating Away
 
       If you run Ruby Sass using the command-line `sass` executable, all you
       need to do is install Dart Sass's [command-line executable][install]