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/next/dist/server/app-render/server-inserted-html.d.ts

@@ -0,0 +1,7 @@
+import type { JSX } from 'react';
+export declare function createServerInsertedHTML(): {
+    ServerInsertedHTMLProvider({ children }: {
+        children: JSX.Element;
+    }): import("react/jsx-runtime").JSX.Element;
+    renderServerInsertedHTML(): import("react/jsx-runtime").JSX.Element[];
+};