week-6: complete 404 and repository pages implementation

Deliverables:
- Implemented language-specific 404 pages (404.en.html, 404.it.html)
  * Hugo i18n template pattern for automatic language routing
  * Full translation support for all UI strings
  * Easter egg modal with interactive experience
  * Theme-aware styling (dark/light mode)
  * Search functionality and recent articles

- Built Repository page with full Slackware package showcase
  * Hero section, quick start guide, installation instructions
  * Responsive card grid layout for packages
  * GitHub repository links with visit buttons
  * Complete i18n translations for all content
  * Theme-aware styling throughout

- Integrated Repository menu entry
  * Added to main navigation in both languages
  * Positioned between Contact and Privacy (weight: 4)
  * Added missing i18n translation keys

Testing:
- Verified 404 routing works correctly in Hugo dev server
- Validated all translations display without warnings
- Confirmed theme switching works on both pages
- Tested mobile and desktop layouts
- Menu entries render correctly in all views

Cleanup:
- Removed outdated Week 1-5 documentation
- Archived progress reports in git history
- Retained essential technical documentation

Status: Ready for Week 7 implementation

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

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