add optional nginx configs to make more secure
Add back some items removed in https://github.com/gitlabhq/gitlabhq/commit/8aff39a6d0a63e904ada910900ee07a1c3190a9d but makes them optional so they can be ignored if you want a simple setup experience.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Add back some items removed in https://github.com/gitlabhq/gitlabhq/commit/8aff39a6d0a63e904ada910900ee07a1c3190a9d but makes them optional so they can be ignored if you want a simple setup experience.