public function showMove($bookSlug, $pageSlug)
{
$book = $this->bookRepo->getBySlug($bookSlug);
$page = $this->pageRepo->getBySlug($pageSlug, $book->id);
$this->checkOwnablePermission('page-update', $page);
return view('pages/move', ['book' => $book, 'page' => $page]);
}