* master: (30 commits)
  Add GitLab host to 2FA QR and manual info
  Fix broken test
  Fix rubocop
  Fix specs in Ruby 2.1
  Clearer comment as to why the procedure is needed
  Ensure issuable state changes only fire webhooks once
  Improve performance on RemoveDuplicatesFromRoutes migration
  Fix the AddNameIndexToNamespace migration to be reversible
  Use optimized query to fill the routes table when running PostgreSQL
  Don't use the Route model in migrations
  Added KaTeX license and procedure to build it for Gitlab
  [ci skip] UX Guide: add guidance on cursor usage
  Changes after review
  Add missing group policy spec
  Limit description container for mrs while viewing side by side diff
  Refactor Namespace#parents method
  Change SlackService to SlackNotificationsService
  Made Ci::Builds to have same ref as Ci::Pipeline in dev fixtures
  Mattermost Notifications Service
  Replace static fixture for abuse_reports_spec (!7644)
  ...