rook-dev group is deprecated

[jbw...@gmail.com]

Hey there everyone! As per https://github.com/rook/rook/issues/9508, we wanted to send an official note to this mailing list that it will be deprecated and closed now.

The best places to connect with the Rook community can be found in the Contact section of the rook/rook README: https://github.com/rook/rook/#contact

Slack and Github (discussions and issues) are our favorites :)

See you all around the community, looking forward to continuing to engage and make Rook great!