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.

DEPLOYMENT.md

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+# Multi-Blog Subdomain Deployment Guide
+
+This project deploys 12 separate blogs to individual subdomains using Netlify.
+
+## Subdomain Structure
+
+Each blog collection gets its own subdomain:
+
+- `art.neeldhara.blog` → Art blog posts
+- `bfs.neeldhara.blog` → BFS algorithm posts  
+- `dfs.neeldhara.blog` → DFS algorithm posts
+- `problems.neeldhara.blog` → Problem-solving posts
+- `puzzles.neeldhara.blog` → Puzzle posts
+- `reviews.neeldhara.blog` → Review posts
+- `reflections.neeldhara.blog` → Reflection posts
+- `vibes.neeldhara.blog` → Vibes posts
+- `workflows.neeldhara.blog` → Workflow posts
+- `magic.neeldhara.blog` → Mathematical magic posts
+- `contests.neeldhara.blog` → Contest posts
+- `poetry.neeldhara.blog` → Poetry posts
+- `blog.neeldhara.blog` → Main blog posts
+
+## How It Works
+
+1. **Main Site**: All content is built and deployed to `neeldhara.blog`
+2. **Subdomain Redirects**: Each subdomain (e.g., `art.neeldhara.blog`) redirects to the main site with the appropriate path (e.g., `neeldhara.blog/art/`)
+3. **Netlify Configuration**: The `netlify.toml` file handles all the redirect rules
+
+## Deployment Steps
+
+1. **Build the site**: `npm run build`
+2. **Deploy to Netlify**: Connect your Git repository to Netlify
+3. **Configure domains**: Set up the custom domains in Netlify:
+   - Main site: `neeldhara.blog`
+   - Subdomains: `art.neeldhara.blog`, `bfs.neeldhara.blog`, etc.
+4. **DNS Configuration**: Point all subdomains to your Netlify site
+
+## Example URLs
+
+Local development:
+- `http://localhost:4323/art/algorithmic-sketches`
+
+Production:
+- `https://art.neeldhara.blog/algorithmic-sketches`
+- `https://neeldhara.blog/art/algorithmic-sketches` (direct access)
+
+Both URLs serve the same content thanks to the redirect configuration.
+
+## Testing
+
+After deployment, verify that:
+1. Each subdomain homepage loads correctly (e.g., `art.neeldhara.blog`)
+2. Individual blog posts load correctly (e.g., `art.neeldhara.blog/algorithmic-sketches`)
+3. RSS feeds work (e.g., `art.neeldhara.blog/rss.xml`)