Remove a bunch of reserved top level routes

These don't seem to be used anywhere, so can be removed.

lib/gitlab/path_regex.rb

@@ -16,7 +16,6 @@ module Gitlab
       .well-known
       abuse_reports
       admin
-      all
       api
       assets
       autocomplete
@@ -27,29 +26,20 @@ module Gitlab
       groups
       health_check
       help
-      hooks
       import
       invites
-      issues
       jwt
       koding
-      member
-      merge_requests
-      new
-      notes
       notification_settings
       oauth
       profile
       projects
       public
-      repository
       robots.txt
       s
       search
       sent_notifications
-      services
       snippets
-      teams
       u
       unicorn_test
       unsubscribes