add section for contents

_includes/nav-css.html

@@ -120,6 +120,7 @@
 <li>
   <a href="#sass">Using Sass</a>
   <ul class="nav">
+    <li><a href="#sass-contents">What's included</a></li>
     <li><a href="#sass-installation-rails">Rails install</a></li>
     <li><a href="#sass-installation-compass">Compass install</a></li>
     <li><a href="#sass-installation-sass-only">Sass install</a></li>

css.html

@@ -3314,6 +3314,12 @@ a {
     </div>
     <p class="lead">While Bootstrap is built on Less, it also has an <a href="{{ site.sass_repo }}">official Sass port</a>. We maintain it in a separate GitHub repository and handle updates with a conversion script.</p>
 
+    <h2 id="sass-contents">What's included</h2>
+    <p>Since the Sass port has a separate repo and serves a slightly different audience, the contents of the project differ greatly from the main Bootstrap project. This ensures the Sass port is as compatible with as many Sass-based systems as possible.</p>
+
+    <!-- List of contents here -->
+
+
     <h2 id="sass-installation">Installation</h2>
     <p>Use the appropriate guide for your environment of choice.</p>