docs: def is_yaml_file(filename, show_warnings = False):
      """Check configuration file type is yaml
      Return a boolean indicating wheather the file is yaml format or not
      """
      if is_json_file(filename):
          return(False)
      try:
          config_dict = load_config(filename, file_type = "yaml")
          if(type(config_dict) == str):
              is_yaml = False
          else:
              is_yaml = True
      except:
          is_yaml = False
      return(is_yaml)