Fixed the link to the mail list

- added redirect via hpr_hub .htaccess file
- added links to mastodon, matrix, and mumble

Removed contact and stuff you need to know pages as these are now in the about page

templates/page.tpl.html

@@ -81,7 +81,10 @@
     <nav class="column">
       <h2>Social</h2>
       <ul>
-        <li><a href="http://hackerpublicradio.org/mailman/listinfo/hpr_hackerpublicradio.org" target="_blank">Maillist</a></li>
+        <li><a href="<!--% absolute_url(baseurl) %-->/maillist" >Mailing list</a></li>
+        <li><a href="https://botsin.space/@hpr" >Mastodon</a></li>
+        <li><a href="https://matrix.to/#/#hpr:matrix.org" >Matrix</a></li>
+        <li><a href="mumble://chatter.skyehaven.net:64738/Hacker%20Public%20Radio?version=1.2.0" >Mumble</a></li>
         <li><a href="https://web.libera.chat/gamja/?channels=oggcastplanet" target="_blank">#oggcastplanet</a></li>
         <li><a href="https://twitter.com/HPR">Twitter.com</a></li>
         <li><a href="https://plus.google.com/u/0/s/hacker%20public%20radio" target="_blank">Google+</a></li>