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/lib/to-route.d.ts

@@ -0,0 +1,24 @@
+/**
+ * This transforms a URL pathname into a route. It removes any trailing slashes
+ * and the `/index` suffix.
+ *
+ * @param pathname - The URL path that needs to be optimized.
+ * @returns - The route
+ *
+ * @example
+ * // returns '/example'
+ * toRoute('/example/index/');
+ *
+ * @example
+ * // returns '/example'
+ * toRoute('/example/');
+ *
+ * @example
+ * // returns '/'
+ * toRoute('/index/');
+ *
+ * @example
+ * // returns '/'
+ * toRoute('/');
+ */
+export declare function toRoute(pathname: string): string;