chore: add links to external resources

Author: tglman

templates/index.html

@@ -82,7 +82,9 @@ <h3 class="title-text">
     {% block footer %}
     <footer>
         <small class="subtext">
-            <a href="https://orientdb.dev">orientdb.dev</a>
+            <a href="https://orientdb.dev">OrientDB.dev</a>
+            <a rel="me" href="https://fosstodon.org/@orientdb">Mastodon</a>
+            <a href="https://matrix.to/#/#orientdb:matrix.org">Matrix Chat</a>
         </small>
         <img referrerpolicy="no-referrer-when-downgrade" src="https://tglman.org/OrientDB/matomo.php?idsite=7&amp;rec=1" style="border:0" alt="" />
     </footer>