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/hook/_usp.tpl

@@ -0,0 +1,20 @@
+{if !empty($block.image_url) || ($block.show_title && !empty($block.title))}
+{if !empty($block.link)}
+<a href="{$block.link|escape:'html':'UTF-8'}" class="customhtml-usp d-flex align-items-center">
+{else}
+<div class="customhtml-usp d-flex align-items-center">
+{/if}
+    {if !empty($block.image_url)}
+    <span class="customhtml-usp-icon">
+        <img src="{$block.image_url|escape:'html':'UTF-8'}" alt="">
+    </span>
+    {/if}
+    {if $block.show_title && !empty($block.title)}
+    <span class="customhtml-usp-text">{$block.title|escape:'html':'UTF-8'}</span>
+    {/if}
+{if !empty($block.link)}
+</a>
+{else}
+</div>
+{/if}
+{/if}