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/app-render/app-render-render-utils.d.ts

@@ -0,0 +1,11 @@
+/**
+ * This is a utility function to make scheduling sequential tasks that run back to back easier.
+ * We schedule on the same queue (setTimeout) at the same time to ensure no other events can sneak in between.
+ */
+export declare function scheduleInSequentialTasks<R>(render: () => R | Promise<R>, followup: () => void): Promise<R>;
+/**
+ * This is a utility function to make scheduling sequential tasks that run back to back easier.
+ * We schedule on the same queue (setTimeout) at the same time to ensure no other events can sneak in between.
+ * The function that runs in the second task gets access to the first tasks's result.
+ */
+export declare function pipelineInSequentialTasks<A, B, C>(one: () => A, two: (a: A) => B, three: (b: B) => C): Promise<C>;