code: function navigateToMenuPage() {
  
      console.log('navigating to menu...');
  
      return new Promise((resolve, reject) => {
          if (!menuDoc) {
              initMenu();
          }
          if (!menuDoc) {
              console.warn('No menu configuration exists, cannot navigate to the menu page.');
              reject();
          } else {
              cleanNavigate(menuDoc);
              resolve(menuDoc);
          }
      });
  }
docs: Navigates to the menu page if it exists
  
  @inner
  @alias module:navigation.navigateToMenuPage
  
  @return {Promise}      Returns a Promise that resolves upon successful navigation.