Remove container usage tab and replace with changlog view

Fixes #179

endpoints/api/superuser.py

@@ -118,21 +118,21 @@ def user_view(user):
     'super_user': superusers.is_superuser(user.username)
   }
 
-@resource('/v1/superuser/usage/')
+@resource('/v1/superuser/changelog/')
 @internal_only
 @show_if(features.SUPER_USERS)
-class UsageInformation(ApiResource):
-  """ Resource for returning the usage information for enterprise customers. """
+class ChangeLog(ApiResource):
+  """ Resource for returning the change log for enterprise customers. """
   @require_fresh_login
   @verify_not_prod
-  @nickname('getSystemUsage')
+  @nickname('getChangeLog')
   def get(self):
-    """ Returns the number of repository handles currently held. """
+    """ Returns the change log for this installation. """
     if SuperUserPermission().can():
-      return {
-        'usage': model.get_repository_usage(),
-        'allowed': app.config.get('MAXIMUM_REPOSITORY_USAGE', 20)
-      }
+      with open ('CHANGELOG.md', 'r') as f:
+        return {
+          'log': f.read()
+        }
 
     abort(403)