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/build/normalize-catchall-routes.d.ts

@@ -0,0 +1,9 @@
+import { AppPathnameNormalizer } from '../server/normalizers/built/app/app-pathname-normalizer';
+/**
+ * This function will transform the appPaths in order to support catch-all routes and parallel routes.
+ * It will traverse the appPaths, looking for catch-all routes and try to find parallel routes that could match
+ * the catch-all. If it finds a match, it will add the catch-all to the parallel route's list of possible routes.
+ *
+ * @param appPaths The appPaths to transform
+ */
+export declare function normalizeCatchAllRoutes(appPaths: Record<string, string[]>, normalizer?: AppPathnameNormalizer): void;