docs: def main():
      """
      Starts the Application.
  
      :return: Definition success.
      :rtype: bool
      """
  
      args = get_command_line_arguments()
      args.css_file = args.css_file if foundations.common.path_exists(args.css_file) else CSS_FILE
      return reStructuredText_to_html(args.input,
                                      args.output,
                                      args.css_file)