stop teams repo from managing t-compiler/meeting

It is preferred that the membership of this Zulip ping group be managed
in an ad-hoc way, some members do not attend, and some members prefer
not to be pinged so they get notified about subsequent direct pings, etc.

teams/compiler.toml

@@ -107,6 +107,3 @@ include-subteam-members = true
 
 [[zulip-groups]]
 name = "T-compiler"
-
-[[zulip-groups]]
-name = "T-compiler/meeting"