remove references to tag subscriptions

config/danbooru_default_config.rb

@@ -169,21 +169,11 @@ module Danbooru
       end
     end
 
-    # Max number of posts to cache
-    def tag_subscription_post_limit
-      200
-    end
-
     # After this many pages, the paginator will switch to sequential mode.
     def max_numbered_pages
       1_000
     end
 
-    # Max number of tag subscriptions per user
-    def max_tag_subscriptions
-      5
-    end
-
     # Maximum size of an upload.
     def max_file_size
       35.megabytes