Update website

docs/index.html

@@ -641,7 +641,7 @@ <h1><a name="community" href="#community" class="heading-anchor">🔗</a>Communi
 <li>Also see here for information about <a href="https://discourse.joplinapp.org/c/news">the latest releases and general news</a>.</li>
 <li>For bug reports and feature requests, go to the <a href="https://github.com/laurent22/joplin/issues">GitHub Issue Tracker</a>.</li>
 <li>The latest news are posted <a href="https://www.patreon.com/joplin">on the Patreon page</a>.</li>
-<li>You can also follow us on <a href="https://twitter.com/joplinapp">the Twitter feed</a>.</li>
+<li>You can also follow us on <a rel="me" href="https://mastodon.social/@joplinapp">the Mastodon feed</a> or <a href="https://twitter.com/joplinapp">the Twitter feed</a>.</li>
 </ul>
 <h1><a name="contributing" href="#contributing" class="heading-anchor">🔗</a>Contributing</h1>
 <p>Please see the guide for information on how to contribute to the development of Joplin: <a href="https://github.com/laurent22/joplin/blob/master/CONTRIBUTING.md">https://github.com/laurent22/joplin/blob/master/CONTRIBUTING.md</a></p>