Add link to Gazebo Ionic (#29)

I already updated the configuration file but still need
an html link to the Gazebo Ionic view.

Signed-off-by: Steve Peters <[email protected]>

Author: scpeters

pages/index.html

@@ -39,6 +39,7 @@ <h1 id="head"></h1>
       <li><a href="?distribution=fortress">Fortress</a></li>
       <li><a href="?distribution=garden">Garden</a></li>
       <li><a href="?distribution=harmonic">Harmonic</a></li>
+      <li><a href="?distribution=ionic">Ionic</a></li>
     </ul>
 
     <ul>