Add RobotsConf teaser

css/main.css

@@ -344,3 +344,6 @@ ol.toc ol li:before {
   margin-bottom: 20px;
   margin-left: 20px;
 }
+.teaser {
+  text-align: center;
+}

index.md

@@ -23,8 +23,12 @@ title: The NodeCopter - Programming flying robots with node.js
 
 <h2 id="upcoming-events"><a href="#upcoming-events">Upcoming Events</a></h2>
 
+<p class="teaser">
+  <a href="http://robotsconf.com"><img src="/img/robotsconf.png" width="369" height="286" /></a>
+</p>
+
 * [Nov 23, 2013 - Sheffield](/2013/sheffield/nov-23) by [Andrew Nesbitt](https://twitter.com/teabass) & [Caolan McMahon](https://twitter.com/caolan)
-* [Dec 6-7, 2013 - Amelia Island](http://robotsconf.com/) by [Chris](https://twitter.com/voodootikigod) & [Laura](https://twitter.com/lwilliams) (RobotsConf!)
+* [Dec 6-7, 2013 - Amelia Island](http://robotsconf.com) by [Chris](https://twitter.com/voodootikigod) & [Laura](https://twitter.com/lwilliams) (RobotsConf!)
 
 <hr>