UI additions for StorageRegion, Storage, ReplicationConfig

We'll need additions to the web ui for the StorageRegion, Storage, and ReplicationConfig entities.

The StorageRegion should get it's own pages with ReplicationConfig available when viewing a single Region.

The Storage information should be displayed when viewing a Bag, along with the Fixities which it holds. Updates possible but will be held off on adding the moment.

Deletion should be possible for all, given the correct authorization.