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/pages/blog/index.astro

@@ -0,0 +1,20 @@
+---
+import DefaultLayout from '@/layouts/DefaultLayout.astro';
+import { SITE_TITLE, SITE_DESCRIPTION } from '@/consts';
+import { getCollection } from 'astro:content';
+import { BlogPosts } from '@/components/sections/blog-posts';
+import NewsletterSignup from '@/components/sections/newsletter-signup';
+
+const posts = (await getCollection('blog')).sort(
+	(a, b) => b.data.pubDate.valueOf() - a.data.pubDate.valueOf(),
+);
+
+const blogTitle = `Blog | ${SITE_TITLE}`;
+const blogDescription = "Explore our blog for insightful articles, personal reflections and updates from our team.";
+---
+
+<DefaultLayout title={blogTitle} description={blogDescription}>
+	<BlogPosts posts={posts} collection="blog" client:only='react' />
+	<NewsletterSignup client:load />
+</DefaultLayout>
+