Added fullscreen button.

src/www/index.html

@@ -37,6 +37,7 @@
                 <li><a href="#" class=pause-continue>Pause Monitoring</a></li>
                 <li><a href="#" class=refresh>Refresh Now</a></li>
                 <li><a href="#" class=show-config>Config</a></li>
+                <li><a href="#" class=toggle-fullscreen>Go Fullscreen</a></li>
             </ul>
         </section>
         <section id=config-dialog>