feat: enhance deployment and media handling

- Updated deployment configurations to disable Incremental Static Regeneration (ISR) and cache on demand pages for better performance control.
- Extended .gitignore to include deployment-specific directories, preventing unnecessary files from being tracked.
- Improved video handling in content by adding support for additional video types and enhancing video element attributes for better playback control.
- Refactored post retrieval logic to ensure channel information is correctly merged and SEO data is accurately assigned.
- Enhanced static file handling to include error handling and domain whitelisting for security and reliability.

vercel.json

@@ -0,0 +1,5 @@
+{
+  "rewrites": [
+    { "source": "/static/:path*", "destination": "/api/static" }
+  ]
+}