opendev.org: add status update links

This adds links to @opendevinfra; the Mastodon one allows us to have a
"green" certified link to opendev.org in our Mastodon profile.

Change-Id: Ic127ceb4abd2d89cd6155e8831145fa3b3705664

docker/gitea/custom/templates/home.tmpl

@@ -180,6 +180,7 @@ functionality is limited.</p>
                         <li>IRC #opendev on OFTC (<a href="https://meetings.opendev.org/irclogs/%23opendev/">logs</a>)</li>
                         <li>Mailing list: service-discuss@lists.opendev.org (<a href="http://lists.opendev.org/cgi-bin/mailman/listinfo/service-discuss">subscribe</a>)</li>
                         <li>Important announcements: service-announce@lists.opendev.org (<a href="http://lists.opendev.org/cgi-bin/mailman/listinfo/service-announce">subscribe</a>)</li>
+                        <li>Status updates on <a rel="me" href="https://fosstodon.org/@opendevinfra">Mastodon</a> or <a href="https://twitter.com/opendevinfra/">Twitter</a><li>
                     </ul>
 
                 <h2 id="service-vulnerabilities">Service vulnerabilities</h2>