docs: def create_app(config=None, config_obj=None):
      """Flask app factory function.
  
      Args:
          config (Optional[path]): path to a Python module config file
          config_obj (Optional[class]): Python config object
      """
      app = Flask(__name__)
      # configure application from external configs
      configure_app(app, config=config, config_obj=config_obj)
      # register different parts of the application
      register_blueprints(app)
      # setup extensions
      bind_extensions(app)
      return app