Add 50 new experimental HTML themes for Gemtexter

- Generated 50 unique themes with creative layouts and color schemes
- Each theme includes:
  - Custom CSS with W3C validated styles
  - Example HTML preview page
  - Font files with proper licensing
  - Theme configuration file
  - License documentation

- Layout types include: centered, wide, magazine, card, brutalist,
  terminal, book, hero, sidebar, and more creative designs

- All themes support both light and dark color schemes
- Fixed CSS validation issues for W3C compliance
- Created theme gallery page at extras/html/themes/index.html
- Added screenshot previews for all themes

- Utility scripts included:
  - generate_50_themes.py - Main theme generator
  - fix_css_validation.py - CSS validator/fixer
  - create_theme_previews.py - Screenshot generator
  - Theme gallery with filtering at index.html

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

1 files changed, 0 insertions, 0 deletions

diff --git a/extras/html/themes/pure_voyage/code.ttf b/extras/html/themes/pure_voyage/code.ttf
new file mode 100644
index 0000000..78ca9da
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+++ b/extras/html/themes/pure_voyage/code.ttf