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

resources/assets/js/components/index.js

@@ -19,6 +19,7 @@ let componentMapping = {
     'toggle-switch': require('./toggle-switch'),
     'page-display': require('./page-display'),
     'shelf-sort': require('./shelf-sort'),
+    'homepage-control': require('./homepage-control'),
 };
 
 window.components = {};