Add hugo-theme-blunix to themes list

[tux2linux]

I made sure:

• your theme.toml is complete
  • name: hugo-theme-blunix
  • license: MIT
  • licenselink: https://github.com/Blunix-GmbH/hugo-theme-blunix/blob/main/LICENSE
  • description: A professional, clean Hugo theme designed for consulting and service-based businesses. Features a flexible block-based page layout system, multilingual support, and modern responsive design.
  • homepage: https://www.blunix.com
  • demosite: https://www.blunix.com
  • tags: Block-based page builder, Multilingual support, Responsive, SEO optimized
  • features: https://github.com/Blunix-GmbH/hugo-theme-blunix/tree/main?tab=readme-ov-file#features
  • authors/author: https://github.com/richtermac
  • original (if the theme is a fork) -> its not a fork
• you're using absolute paths for images in your README
• you've got appropriate thumbnail and screenshot images
• your theme comes with an appropriate license

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