Added bookshelves homepage options

- Updated homepage selection UI to be more scalable
- Cleaned homepage selection logic in code
- Added seed test data for bookshelves
- Added bookshelves to permission system

app/Repos/EntityRepo.php

@@ -1250,14 +1250,14 @@ class EntityRepo
      */
     public function destroyPage(Page $page)
     {
-        $this->destroyEntityCommonRelations($page);
-
         // Check if set as custom homepage
         $customHome = setting('app-homepage', '0:');
         if (intval($page->id) === intval(explode(':', $customHome)[0])) {
             throw new NotifyException(trans('errors.page_custom_home_deletion'), $page->getUrl());
         }
 
+        $this->destroyEntityCommonRelations($page);
+
         // Delete Attached Files
         $attachmentService = app(AttachmentService::class);
         foreach ($page->attachments as $attachment) {