change: link of element (sns)

Author: Lemon73-Computing

sns/index.html

@@ -74,7 +74,7 @@ <h3>その他</h3>
 		<ul>
 			<li><a href="https://lemon73.booth.pm">Booth</a></li>
 			<li><a href="discord">Discord</a></li>
-			<li><a href="https://app.element.io/#/room/#lec-main:matrix.org">Element</a></li>
+			<li><a href="https://matrix.to/#/@lemon73:matrix.org">Element</a></li>
 			<li><a href="https://play.unity.com/u/Lemon73">Unity play</a></li>
 			<li><a href="https://steamcommunity.com/profiles/76561199447542409/">Steam</a></li>
 		</ul>