feat(main): Introduce USP block type and custom classes for HTML groups

This release adds a new "USP" (Unique Selling Proposition) block type,
allowing for flexible display of image-based selling points with optional links.

Additionally, administrators can now assign custom CSS classes to Custom HTML Groups,
enhancing layout and styling capabilities.

Includes a refinement to the FAQ accordion template to ensure questions without answers
do not display a collapse button, improving usability.

Updates module version to 1.13.0 with a database upgrade script for the new `custom_class` column.

src/Grid/Query/CustomHtmlGroupQueryBuilder.php

@@ -32,6 +32,7 @@ final class CustomHtmlGroupQueryBuilder extends AbstractDoctrineQueryBuilder
             'wchg.`id_ws_customhtml_group`',
             'wchg.`title`',
             'wchg.`hook_name`',
+            'wchg.`custom_class`',
             'wchg.`active`',
             'wchg.`ordering`',
             'wchg.`date_add`',