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/pages/_app.d.ts

@@ -0,0 +1,17 @@
+import React from 'react';
+import type { AppContextType, AppInitialProps, AppPropsType, NextWebVitalsMetric, AppType } from '../shared/lib/utils';
+import type { Router } from '../client/router';
+export type { AppInitialProps, AppType };
+export type { NextWebVitalsMetric };
+export type AppContext = AppContextType<Router>;
+export type AppProps<P = any> = AppPropsType<Router, P>;
+/**
+ * `App` component is used for initialize of pages. It allows for overwriting and full control of the `page` initialization.
+ * This allows for keeping state between navigation, custom error handling, injecting additional data.
+ */
+declare function appGetInitialProps({ Component, ctx, }: AppContext): Promise<AppInitialProps>;
+export default class App<P = any, CP = {}, S = {}> extends React.Component<P & AppProps<CP>, S> {
+    static origGetInitialProps: typeof appGetInitialProps;
+    static getInitialProps: typeof appGetInitialProps;
+    render(): import("react/jsx-runtime").JSX.Element;
+}