Remove community_id config option

mautrix_telegram/example-config.yaml

@@ -78,12 +78,6 @@ appservice:
     bot_displayname: Telegram bridge bot
     bot_avatar: mxc://maunium.net/tJCRmUyJDsgRNgqhOgoiHWbX
 
-    # Community ID for bridged users (changes registration file) and rooms.
-    # Must be created manually.
-    #
-    # Example: "+telegram:example.com". Set to false to disable.
-    community_id: false
-
     # Whether or not to receive ephemeral events via appservice transactions.
     # Requires MSC2409 support (i.e. Synapse 1.22+).
     # You should disable bridge -> sync_with_custom_puppets when this is enabled.