feat(blog): add file-based blog with dynamic slugs, MDX content and layout shell

- Introduced blog routing using Next.js App Router
- Implemented dynamic [slug] pages for blog posts
- Added MDX-based content loading via lib/posts
- Integrated shared TopBar layout with navigation
- Established clear content, lib and component separation

apps/public-web/node_modules/styled-jsx/global.d.ts

@@ -0,0 +1,8 @@
+import React from 'react'
+
+declare module 'react' {
+  interface StyleHTMLAttributes<T> extends HTMLAttributes<T> {
+    jsx?: boolean
+    global?: boolean
+  }
+}