changed matrix invite from riot.im to matrix.to

public/packages.html

@@ -109,7 +109,7 @@
                         Social <i class="fa fa-share-alt-square"></i>
                     </li>
                     <li>
-                        <a href="https://riot.im/app/#/room/#src_prepare:matrix.org">
+                        <a href="https://matrix.to/#/#src_prepare:matrix.org">
                             Matrix
                         </a>
                     </li>