* master: (154 commits)
  Fix typos
  Fix wrong changelog item
  Add missing item for 8.13.6
  Change last_used_at to use touch
  Add chat_name partial
  Mention Git strategy none
  Fix code review
  adds fix for security issue when annonymous user does not ...
  Remove ToC since it's now supported in the docs portal itself
  Add 8.14 to versions with further additions to review apps
  Add Limitations sections to environments and review apps docs
  Add link to environments docs
  Fix URL to review apps docs
  Add a prerequisites section, add some links
  Link to NGINX example project for the time being
  Get rid most of the irrelevant sections
  Add note about current limitation in $CI_BUILD_REF_NAME
  Add an intro and an Overview section for Review Apps
  WIP review apps
  Add Review apps link to CI README
  ...

Conflicts:
  spec/features/environments_spec.rb