docs: def setup(app):
      """
      Setup for Sphinx extension.
  
      :param app: Sphinx application context.
      """
      app.info('adding remote-code-block directive...', nonl=True)
      app.add_directive('remote-code-block', RemoteCodeBlock)
      app.info(' done')
      return {
          'version': __version__,
          'parallel_read_safe': True,
          'parallel_write_safe': True,
          }