[#65,refactor][xs]: remove read-only link in app (was for demo not app).

app/index.html

@@ -66,7 +66,6 @@
               </li>
             </ul>
           </li>
-          <li><a class="set-read-only" title="Put into read-only mode">Read-only</a></li>
         </ul>
       </div>
     </div>

app/js/app.js

@@ -17,12 +17,6 @@ $(function() {
 
   // setup the loader menu in top bar
   setupLoader(createExplorer);
-
-  // set up readonly enabling in top bar
-  $('a.set-read-only').click(function() {
-    window.dataExplorer.setReadOnly();
-    alert('Read-only mode set');
-  });
 });
 
 // make Explorer creation / initialization in a function so we can call it