NOX Holding Theme Update

What changed:
- Homepage content is now editable from: Appearance > NOX Theme Settings
- Added Culture section with 3 media slots
- Added Global Reach country flags support
- Added per-company dedicated link/button fields
- Added blog listing at /blog/ using normal WordPress Posts
- Added single post template and generic page template
- Added support for WordPress menus

Important after activating/replacing theme:
1. Go to Settings > Permalinks > Save Changes once.
2. Go to Appearance > NOX Theme Settings and update any text/images.
3. Go to Appearance > Menus if you want a fully custom main menu.
4. Blog articles are managed from Posts > Add New.


Version 3 notes:
- Fixed anchor links validation in admin settings.
- Blog archive stays on /blog/.
- Single blog posts now use /blog/{post-id}/.
- Added blog pagination rewrite rule.
