Stig-Ørjan Smelror 7521c744bd Improve qsgen3 theme system: complete theme override and new minimal theme
- Remove legacy themes (black-orange, minimal) with old .tpl structure
- Create new minimal theme with proper qsgen3 structure:
  - Complete layouts/ directory with all required templates
  - Modern CSS with responsive design and clean styling
  - Proper theme documentation in README.md
- Update THEMES-HOWTO.md to accurately reflect theme behavior:
  - Clarify complete layout override (no fallback to defaults)
  - Document included minimal theme example
  - Correct layout processing documentation
- Update site.conf to use new minimal theme CSS path
- Ensure themes are complete packages when specified
2025-05-31 03:14:36 +02:00
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