public function removePageAction()
 {
     $page = $this->navigationManager->getPage($this->params('page'));
     $this->assertGranted('navigation.manage', $page);
     $this->navigationManager->removePage($page->getId());
     $this->navigationManager->flush();
     $this->flashMessenger()->addSuccessMessage('The page was successfully removed');
     return $this->redirect()->toReferer();
 }