Update templates/content-about.tpl.html

Fixed the location for the mumble howto

templates/content-about.tpl.html

@@ -680,7 +680,7 @@
   Once you are ready press the <strong>recording</strong> button, select <em>multichannel</em> and then <em>start</em>. 
   That will record multiple tracks, one for each participant which you can edit and then submit.
   <br />
-  Kwisher made a <a href="<!--% absolute_url(baseurl) %-->Mumble-How-To.pdf">Mumble tutorial</a> 
+  Kwisher made a <a href="<!--% absolute_url(baseurl) %-->mumble-howto">Mumble tutorial</a> 
   which you might find useful and <a href="<!--% absolute_url(baseurl) %-->correspondents/0228.html">Delwin</a> 
   has produced a number of short shows on how to configure the audio quality.
   </p>

templates/page.tpl.html

@@ -86,6 +86,7 @@
         <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://t.me/+6fEhQrf5IEc4ZGU8">Telegram</a></li>
         <li><a href="https://twitter.com/HPR">Twitter.com</a></li>
         <li><a href="https://www.facebook.com/HenryPartickReilly" target="_blank">Facebook</a></li>
         <li><a href="https://www.linkedin.com/company/hackerpublicradio/" target="_blank">Linked-In</a></li>