Add comprehensive documentation for all VirtueMart module overrides

Co-authored-by: jmiller-moko <230051081+jmiller-moko@users.noreply.github.com>

src/templates/html/mod_virtuemart_category/README.md

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+# mod_virtuemart_category Mobile Responsive Override
+
+## Overview
+Mobile-responsive category navigation with hierarchical structure, optional images, product counts, and active state highlighting.
+
+## Key Features
+- Hierarchical category/subcategory display
+- Optional category images (40x40px)
+- Product count badges
+- Active page highlighting
+- Touch-friendly links (48px mobile, 44px desktop)
+- Collapsible subcategory lists
+
+## Responsive Features
+- Full-width category links on mobile
+- Indented subcategory lists
+- Active state styling
+- Hover effects
+
+## Module Parameters Supported
+- `show_images` - Display category images
+- `show_description` - Show category descriptions
+- `show_product_count` - Display product counts
+- `moduleclass_sfx` - Custom CSS suffix
+
+## CSS Classes
+- `.mod-vm-category-responsive` - Main container
+- `.mod-vm-category__nav` - Navigation element
+- `.mod-vm-category__list` - Main category list
+- `.mod-vm-category__item` - Category item
+- `.mod-vm-category__link` - Category link
+- `.mod-vm-category__link--active` - Active category
+- `.mod-vm-category__sublist` - Subcategory list
+- `.mod-vm-category__sublink` - Subcategory link
+
+## Customization Example
+```css
+.mod-vm-category__link {
+  border-radius: 10px;
+  padding: 1rem;
+}
+
+.mod-vm-category__image {
+  width: 50px;
+  height: 50px;
+}
+```
+
+## Accessibility
+- Semantic navigation element
+- `aria-current="page"` on active items
+- ARIA labels for navigation
+- Keyboard navigation support
+
+## License
+Copyright (C) 2025 Moko Consulting
+GNU General Public License version 2 or later