* master: (22 commits)
  static-analysis fix
  refactored the hashed repository name
  removed 'only once' from the docs
  static analysis fix
  added changelog
  ignore hashed repositories when doing rake gitlab:cleanup:dirs
  Update prometheus Gem to fix compilation on centos 6 duo to GCC not recognizing `std=c11` option
  Add a feedback mechanism to `package-qa` manual action
  Update svg external dependency
  Drastically improve project search performance by no longer searching namespace name
  Deduplicate protected ref human_access_levels
  Fix ProtectedBranch access level validations
  Address feedback for AWS Runner autoscale article
  Clarify usage of Runner limit and AWS tags
  Finish rest of the sections
  Finish all sections except docker.machine
  Add runners.cache section
  Add Runner registration info
  Clear up sections
  Add skeleton
  ...