[docs][xs]: add ids to main headings in docs.

index.html

@@ -66,7 +66,7 @@
     <p>Designed for standalone use or as a library to integrate into your own
     app.</p>
 
-    <h2>Main Features</h2>
+    <h2 id="features">Main Features</h2>
     <ul>
       <li>Open-source (and heavy reuser of existing open-source libraries like
       Backbone)</li>
@@ -79,12 +79,12 @@
       <li>Visualize data</li>
     </ul>
 
-    <h2>Demo</h2>
+    <h2 id="demo">Demo</h2>
     <ul>
       <li><a href="demo/index.html">Demo with local data</a></li>
     </ul>
 
-    <h2>Docs</h2>
+    <h2 id="docs">Docs</h2>
     <p>Want to see how to embed this in your own application. Check out the the
     <a href="demo/">Demo</a> and view source.</p>
     <ul>
@@ -92,7 +92,7 @@
       <li><a href="docs/view.html">Views including the main Data Explorer</li>
     </ul>
 
-    <h2>History</h2>
+    <h2 id="history">History</h2>
     <p>Max Ogden was developing Recline as the frontend data browser and editor
     his <a href="http://datacouch.com/">http://datacouch.com/</a> project.
     Meanwhile, Rufus Pollock and the <a href="http://ckan.org/">CKAN team</a>