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/lib/turbopack-warning.d.ts

@@ -0,0 +1,7 @@
+import type { NextConfigComplete } from '../server/config-shared';
+import loadConfig from '../server/config';
+/**  */
+export declare function validateTurboNextConfig({ dir, configPhase, }: {
+    dir: string;
+    configPhase: Parameters<typeof loadConfig>[0];
+}): Promise<NextConfigComplete>;