removed Longhorn banner

Author: DavertMik

_includes/hero.html

@@ -19,7 +19,6 @@ <h1>PHP Testing for <br>everyone<span class="blue">_</span></h1>
           Support</a>
       </div> <!-- /.row -->
       <div class="text-left">
-        <a href="http://longhornphp.com" target="_blank"><img style="width: 100%;" src="/images/longhornphp.jpg" alt="Longhorn PHP Conference"></a>
       </div>
     </div>
   </div>