docs: def relative_playbook(playbook):
      """ Returns a tuple (controlled, playbook).
  
      - controlled is a boolean indicating whether or not we think that the
        playbook being run was checked in to our ansible git repo.
      - playbook is the relative file path of the playbook.
      """
      if playbook.startswith(fs_prefix):
          return True, playbook[len(fs_prefix):]
      else:
          return False, playbook.split('/')[-1]