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/find-config.d.ts

@@ -0,0 +1,6 @@
+type RecursivePartial<T> = {
+    [P in keyof T]?: RecursivePartial<T[P]>;
+};
+export declare function findConfigPath(dir: string, key: string): Promise<string | undefined>;
+export declare function findConfig<T>(directory: string, key: string, _returnFile?: boolean): Promise<RecursivePartial<T> | null>;
+export {};