feat: Enhanced SEO meta tags across all templates

[Adithyakp86]

#80
📊 Summary of Changes:
SEO Improvements Added:
✅ Meta Descriptions - Optimized for each page (150-160 characters)
✅ Keywords - Relevant keywords for each page type
✅ Open Graph Tags - Complete Facebook/social media optimization
✅ Twitter Cards - Rich Twitter sharing
✅ Structured Data - JSON-LD schema for search engines
✅ Canonical URLs - Prevent duplicate content
✅ Favicon Links - Multiple icon sizes
✅ Performance - Preconnect and DNS prefetch
✅ Robots Meta - Proper search engine directives
Files Status:
5 HTML templates - Enhanced with comprehensive SEO
1 documentation file - Created for reference
0 linting errors - All files validated

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