Add .s2-docs-container to enable anchor.js.

docs/examples.html

@@ -25,7 +25,7 @@ slug: examples
   </div>
 </section>
 
-<div class="container">
+<div class="container s2-docs-container">
   <section id="basic" class="row">
     <div class="col-md-4">
       <h1>The basics</h1>