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/client/dev/hot-middleware-client.d.ts

@@ -0,0 +1,8 @@
+declare const _default: () => {
+    subscribeToHmrEvent(handler: (message: import("../../server/dev/hot-reloader-types").AddedPageMessage | import("../../server/dev/hot-reloader-types").RemovedPageMessage | import("../../server/dev/hot-reloader-types").ReloadPageMessage | import("../../server/dev/hot-reloader-types").DevPagesManifestUpdateMessage) => void): void;
+    onUnrecoverableError(): void;
+    addTurbopackMessageListener(cb: (msg: import("../../server/dev/hot-reloader-types").TurbopackMessageSentToBrowser) => void): void;
+    sendTurbopackMessage(msg: string): void;
+    handleUpdateError(err: unknown): void;
+};
+export default _default;