docs: replace discord with GitHub discussions as community exchange p…

…latform (#112)

Signed-off-by: Sven Trieflinger <[email protected]>

docs/community/participate.md

@@ -1,11 +1,8 @@
 # Participate in the Carbyne Stack Community
 
-## Community Meetings
+We use :fontawesome-brands-github: [GitHub Discussions][gh-discussions]
+for facilitating interaction within the Carbyne Stack community. Feel free to
+ask questions, share ideas, and discuss topics related to the Carbyne Stack
+open source project over there.
 
-We host public Carbyne Stack Community Meetings on :fontawesome-brands-discord:
-[Discord][discord], open to anyone interested in the Carbyne Stack open source
-project, every first Monday of the month at 3pm CE(S)T.
-
-Everyone interested is welcome to attend!
-
-[discord]: https://discord.gg/8sxNPCSBDk
+[gh-discussions]: https://github.com/orgs/carbynestack/discussions