feat: Complete multi-blog setup with 12 collections and subdomain routing

- Added 12 blog collections: art, bfs, dfs, problems, puzzles, reviews, reflections, vibes, workflows, magic, contests, poetry
- Created content config with glob loaders for all collections
- Added sample posts for each collection
- Fixed TypeScript collection recognition by removing duplicate config
- Made BlogPosts component collection-aware for proper routing
- Created individual post pages ([...slug].astro) for each collection
- Added Netlify subdomain routing configuration
- Updated all references to use neeldhara.blog as main domain
- Fixed navigation links in all-blogs component

Ready for GitHub/Netlify deployment with subdomain support.

src/content/magic/gilbreath-principle.md

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+---
+title: "The Gilbreath Principle: When Chaos Creates Order"
+description: "A mathematical card principle that seems impossible but always works - perfect for teaching algorithms."
+pubDate: "Feb 15 2024"
+image: "https://images.unsplash.com/photo-1570543375343-63fe3d67761b?w=400&auto=format&fit=crop&q=60"
+authorImage: "/avatar/avatar1.png"
+authorName: "Neeldhara"
+---
+
+# The Gilbreath Principle: When Chaos Creates Order
+
+Shuffle a deck in a specific way, and mathematical order emerges from apparent chaos.
+
+## The Phenomenon
+
+Arrange cards alternating red-black. Riffle shuffle. Now deal pairs - each pair has one red and one black card. Magic? No, mathematics.
+
+## Why It Works
+
+The riffle shuffle preserves local structure while appearing to randomize. The alternating pattern creates an invariant that survives the shuffle.
+
+## Classroom Implementation
+
+Students predict it won't work. When it does, they're hooked. "Why?" becomes the driving question.
+
+## The Deeper Lesson
+
+Not all randomness is truly random. Structure can hide in apparent disorder. This principle appears in:
+- Network protocols
+- Error-correcting codes  
+- Distributed systems
+
+## Beyond Cards
+
+The Gilbreath Principle teaches us to look for hidden invariants in complex systems.