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/node-environment-extensions/random.d.ts

@@ -0,0 +1,8 @@
+/**
+ * We extend Math.random() during builds and revalidates to ensure that prerenders don't observe randomness
+ * When cacheComponents is enabled. randomness is a form of IO even though it resolves synchronously. When cacheComponents is
+ * enabled we need to ensure that randomness is excluded from prerenders.
+ *
+ * The extensions here never error nor alter the random generation itself and thus should be transparent to callers.
+ */
+export {};