remove unused code from thumbnail

tests/thumbnail.html

@@ -49,31 +49,9 @@
           <ul class="nav navbar-nav">
             <li class="dropdown active">
               <a class="dropdown-toggle" data-toggle="dropdown" href="#" id="themes">Themes <span class="caret"></span></a>
-              <ul class="dropdown-menu" aria-labelledby="themes">
-                <li><a tabindex="-1" href="../default/">Default</a></li>
-                <li class="divider"></li>
-                <li><a tabindex="-1" href="../amelia/">Amelia</a></li>
-                <li><a tabindex="-1" href="../cerulean/">Cerulean</a></li>
-                <li><a tabindex="-1" href="../cosmo/">Cosmo</a></li>
-                <li><a tabindex="-1" href="../cyborg/">Cyborg</a></li>
-                <li><a tabindex="-1" href="../flatly/">Flatly</a></li>
-                <li><a tabindex="-1" href="../journal/">Journal</a></li>
-                <li><a tabindex="-1" href="../readable/">Readable</a></li>
-                <li><a tabindex="-1" href="../simplex/">Simplex</a></li>
-                <li><a tabindex="-1" href="../slate/">Slate</a></li>
-                <li><a tabindex="-1" href="../spacelab/">Spacelab</a></li>
-                <li><a tabindex="-1" href="../united/">United</a></li>
-              </ul>
             </li>
             <li class="dropdown">
               <a class="dropdown-toggle" data-toggle="dropdown" href="#" id="download">Download <span class="caret"></span></a>
-              <ul class="dropdown-menu" aria-labelledby="download">
-                <li><a tabindex="-1" href="../default/">bootstrap.min.css</a></li>
-                <li><a tabindex="-1" href="../amelia/">bootstrap.css</a></li>
-                <li class="divider"></li>
-                <li><a tabindex="-1" href="../cerulean/">variables.less</a></li>
-                <li><a tabindex="-1" href="../cosmo/">bootswatch.less</a></li>
-              </ul>
             </li>
             <li>
               <a href="../help/">Help</a>