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/required-scripts.d.ts

@@ -0,0 +1,9 @@
+import type { BuildManifest } from '../get-page-files';
+export declare function getRequiredScripts(buildManifest: BuildManifest, assetPrefix: string, crossOrigin: undefined | '' | 'anonymous' | 'use-credentials', SRIManifest: undefined | Record<string, string>, qs: string, nonce: string | undefined, pagePath: string): [
+    () => void,
+    {
+        src: string;
+        integrity?: string;
+        crossOrigin?: string | undefined;
+    }
+];