code: def setup(app):
      
  
      app.add_directive('readthedocs-embed', EmbedDirective)
      app.add_config_value('readthedocs_embed_project', '', 'html')
      app.add_config_value('readthedocs_embed_version', '', 'html')
      app.add_config_value('readthedocs_embed_doc', '', 'html')
  
      return app
docs: This isn't used in Production,
      but allows this module to be used as a standalone extension.