Replace meetup on website front page (#5598)

(closest ones do not have sign up pages yet)

website/index.html

@@ -94,7 +94,7 @@
 </div>
 <div id="announcement" class="colored-block">
      <div class="page">
-         Upcoming ClickHouse Meetup: <a class="announcement-link" href="https://www.huodongxing.com/event/2483759276200" rel="external nofollow" target="_blank">Beijing</a> on June 8
+         Upcoming ClickHouse Meetup: <a class="announcement-link" href="https://www.huodongxing.com/event/3483759917300" rel="external nofollow" target="_blank">Shenzhen</a> on October 20
      </div>
 </div>
 <div class="page">