docs: def find_config_files():
      """Return a list of default configuration files.
      """
  
      config_files = []
  
      for config_dir in _get_config_dirs():
          path = os.path.join(config_dir, "rapport.conf")
          if os.path.exists(path):
              config_files.append(path)
  
      return list(filter(bool, config_files))