Mention stack overflow instead of the mailing list.

Apparently the mailing list hasn't been working since months.

index.html

@@ -132,6 +132,7 @@
                             <h2>Features</h2>
                         </header>
                         <ul class="features">
+                            <li>Presence information (online, busy, away)</li>
                             <li>Single-user chat</li>
                             <li>Contacts and groups</li>
                             <li>Multi-user chatrooms (<a href="http://xmpp.org/extensions/xep-0045.html" target="_blank">XEP 45</a>)</li>
@@ -141,7 +142,6 @@
                             <li>Service discovery (<a href="http://xmpp.org/extensions/xep-0030.html" target="_blank">XEP 30</a>)</li>
                             <li>In-band registration (<a href="http://xmpp.org/extensions/xep-0077.html" target="_blank">XEP 77</a>)</li>
                             <li>Roster item exchange (<a href="http://xmpp.org/extensions/xep-0144.html" target="_blank">XEP 144</a>)</li>
-                            <li>Chat statuses (online, busy, away)</li>
                             <li>Custom status messages</li>
                             <li>Typing and chat state notifications (<a href="http://xmpp.org/extensions/xep-0085.html" target="_blank">XEP 85</a>)</li>
                             <li>Desktop notifications</li>
@@ -191,11 +191,10 @@
                     <h2>Contact</h2>
                     <ul class="contact">
                         <li>Follow me on <a href="http://twitter.com/jcopkode" target="_blank">Twitter</a> or chat with me via XMPP at <a href="xmpp:jc@opkode.com" class="xmpp JSnocheck" title="XMPP/Jabber">jc@opkode.com</a>.</li>
-                        <li>For technical support, please write to the mailing list: <a href="mailto:conversejs@librelist.com">conversejs@librelist.com</a><br/>
-                            or ask in the Converse.js chat room: <a href="xmpp:discuss@conference.conversejs.org" class="xmpp JSnocheck" title="Converse.js chat room">discuss@conference.conversejs.org</a>.</li>
-                        <li>Also check out the <a href="http://librelist.com/browser/conversejs" target="_blank">mailing list archives</a>.</li>
+                        <li>For technical support, you can ask on <a href="http://stackoverflow.com/questions/tagged/converse.js">Stack Overflow</a>
+                            or if you have a more simple question you can ask us in the Converse.js chat room: <a href="xmpp:discuss@conference.conversejs.org" class="xmpp JSnocheck" title="Converse.js chat room">discuss@conference.conversejs.org</a>.</li>
                         <li>Please file <a target="_blank" href="https://github.com/jcbrand/converse.js/issues">bugs on Github</a>.</li>
-                        <li>I'm available for features and <a href="http://opkode.com/contact" target="_blank">consulting</a>.</li>
+                        <li>I'm available for paid-for features, custom development and consulting. Here's my <a href="http://opkode.com/contact" target="_blank">contact form</a>.</li>
                     </ul>
                 </div>
                 <div class="sponsors">