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/content-contact.tpl.html

@@ -1,21 +0,0 @@
-  <article>
-    <header>
-        <h1>Contact</h1>
-    </header>
-    <p>We are always looking for more hosts...</p>
-    <ul>
-      <li>email: <strong>admin -at- hackerpublicradio org</strong><br />
-      <em>As an anti-spam measure you will get an error back but we do get your email.</em></li>
-      <li>Website: <a href="http://www.www.hackerpublicradio.org" target="_blank">www.www.hackerpublicradio.org</a></li>
-      <li>Mailist: <a href="http://www.hackerpublicradio.org/maillist" target="_blank">Maillist</a></li>
-      <li><a href="https://web.libera.chat/gamja/?channels=oggcastplanet" target="_blank">#oggcastplanet</a></li>
-      <li><a href="https://www.facebook.com/home.php?sk=group_130169220378872¬if_t=group_r2j" target="_blank">Facebook</a></li>
-      <li><a href="https://www.linkedin.com/company/hackerpublicradio/" target="_blank">Linked-In</a></li>
-      <li><a href="http://itunes.apple.com/us/podcast/hacker-public-radio/id281699640" target="_blank">iTunes</a></li>
-    </ul>
-    <h2>Mail List</h2>
-    <p>
-    HPR is governed by the community, so decisions about how Hacker Public Radio should be run are made on the mailing list you can join it by going to :<br />
-    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="http://www.hackerpublicradio.org/maillist">http://www.hackerpublicradio.org/maillist</a>
-    </p>
-  </article>