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/compiled/webpack/webpack.d.ts

@@ -0,0 +1,15 @@
+export namespace webpack {
+  export type Compiler = any
+  export type Plugin = any
+  export type Configuration = any
+  export type StatsError = any
+  export type Stats = any
+  export type MultiCompiler = any
+  export type EntryObject = any
+  export type ProgressPlugin = any
+  export type Compilation = any
+  export type javascript = any
+  export type Module = any
+  export type ModuleGraph = any
+  export type WebpackPluginInstance = any
+}