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/form.d.ts

@@ -0,0 +1,9 @@
+import { type FormProps } from './form-shared';
+export type { FormProps };
+declare const Form: import("react").ForwardRefExoticComponent<Omit<{
+    action: NonNullable<string | ((formData: FormData) => void | Promise<void>) | undefined>;
+    prefetch?: false | null;
+    replace?: boolean;
+    scroll?: boolean;
+} & Omit<import("react").HTMLProps<HTMLFormElement>, "action" | "method" | "target" | "encType">, "ref"> & import("react").RefAttributes<HTMLFormElement>>;
+export default Form;