changed matrix invite from riot.im to matrix.to

public/index.html

@@ -85,7 +85,7 @@
 
             <p>
                 Join our community on
-                <a href="https://riot.im/app/#/room/#src_prepare:matrix.org">
+                <a href="https://matrix.to/#/#src_prepare:matrix.org">
                     Matrix
                     <i class="fa fa-comment"></i>
                 </a>
@@ -126,7 +126,7 @@
                         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>