Document the gitlab way we use chef
This is the start of the documentation mentioned in https://gitlab.com/gitlab-com/infrastructure/issues/1659 and merging it will close it.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This is the start of the documentation mentioned in https://gitlab.com/gitlab-com/infrastructure/issues/1659 and merging it will close it.