Add navigation accessibility audit report - closes #accessibility-ticket

[anex45]

Navigation Accessibility Improvements

Overview

This PR implements key recommendations from the Navigation Accessibility Audit Report to enhance site navigation and content discoverability.

Changes Made

✅ Implemented Changes

• Added language selector in header/footer navigation
• Expanded Tools dropdown to include all product pages
• Created dedicated Articles section in main navigation
• Improved career page navigation with position listings
• Enhanced dataset page accessibility

🔧 Component Updates

• Modified to include new navigation elements
• Updated with additional links
• Created new shared component for language selection

🔍 Accessibility Enhancements

• Added internal links to previously orphaned pages:
  • Lab/research content
  • Language-specific translations
  • Dataset resources
  • Career opportunities
• Improved sitemap organization and hierarchy

Testing Steps

1. Verify all navigation elements in header/footer
2. Check language selector functionality
3. Confirm all audit-reported pages now have internal links
4. Review mobile responsiveness of new navigation

⚠️ Note for Reviewers
Please pay special attention to:

• Header dropdown menu interactions
• Cross-language linking implementation
• Sitemap categorization changes

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