Add Release Manager MVP-like page
Beginning of consolidation of proposal from: https://gitlab.com/gitlab-com/organization/issues/3
Will add more text about release managers in a subsequent MR.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Beginning of consolidation of proposal from: https://gitlab.com/gitlab-com/organization/issues/3
Will add more text about release managers in a subsequent MR.