[ArticleFeedback] Remove from Wikimedia group

Not longer used on WMF
https://git.wikimedia.org/commitdiff/operations%2Fmediawiki-config/80be5eb9f486456f3f72b159d44f8d67f32ab588

Change-Id: I0c1e1836a4f3a0fabe2719ff02d44ba63652da32