Add first three supporters to sign up.

www/conservancy/static/sponsors/index.html

@@ -52,6 +52,9 @@ any of its sponsors.</p>
 <a id="supporters"></a>
    
 <ul id="supporters">
+  <li>Philippe Gauthi</li>
+  <li>W. John Sullivan</li>
+  <li>Christopher Allan Webber</li>
 </ul>
 
 {% endblock %}