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.

views/templates/admin/form/blocks/block_form.html.twig

@@ -27,7 +27,7 @@
                 {{ form_row(customHtmlBlockForm.content) }}
 
                 {% if currentImageUrl is defined and currentImageUrl %}
-                    <div class="customhtmlblock-type-field customhtmlblock-type-banner customhtmlblock-current-image">
+                    <div class="customhtmlblock-type-field customhtmlblock-type-banner customhtmlblock-type-usp customhtmlblock-current-image">
                         <label class="form-control-label">{{ 'Current image'|trans({}, 'Modules.Wscustomhtml.Admin') }}</label>
                         <div><img src="{{ currentImageUrl }}" alt="" style="max-width: 200px; max-height: 200px;"></div>
                     </div>