Add Lottie Animation Showcase

[kudanai]

Summary

• ✨ Added Lottie animation showcase to homepage with 4 featured animations in 2x2 grid
• 🎨 Created dedicated /demos page displaying more sample animations
• 🏗️ Refactored content structure by moving data to dedicated files for better maintainability
• 🔗 Added proper attribution links for animation creators

New Components & Pages

• LottieCard - Reusable card component for displaying animations with titles and creator attribution
• /demos - New page showcasing complete gallery of sample animations
• Featured animations section - Added between "What is Lottie?" and "About LAC" sections on homepage

Content Organization Improvements

• src/data/sampleAnimations.js - Centralized animation data with metadata for all 16 sample animations
• src/data/homeContent.js - Homepage content (intro, whyLottie, community sections)
• src/data/faqData.js - FAQ content separated from component logic
• Reduced index.js complexity by ~70 lines through data extraction

Screenshots

[Aidosmf]

a few more small suggestion; imho this way looks nicer

[kudanai]