Add "ReScript Online Meetup YouTube Channel" to community overview (#724)

* Add "ReScript Online Meetup YouTube Channel" to community overview

* Also add guild link

Author: fhammerschmidt

pages/community/overview.mdx

@@ -12,6 +12,8 @@ canonical: "/community/overview"
 - [Twitter](https://twitter.com/rescriptlang)
 - [Forum](https://forum.rescript-lang.org)
 - [ReScript GitHub Org](https://github.com/rescript-lang/)
+- [ReScript Online Meetup on Guild](https://guild.host/rescript-online-meetup)
+- [ReScript Online Meetup YouTube Channel](https://www.youtube.com/@ReScriptOnlineMeetup)
 
 News are broadcasted on this site's blog and on Twitter. Some extra, less important news are also posted on the forum's [Announcements category](https://forum.rescript-lang.org/c/announcements/).