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/render-css-resource.d.ts

@@ -0,0 +1,14 @@
+import type { CssResource } from '../../build/webpack/plugins/flight-manifest-plugin';
+import type { AppRenderContext } from './app-render';
+import type { PreloadCallbacks } from './types';
+/**
+ * Abstracts the rendering of CSS files based on whether they are inlined or not.
+ * For inlined CSS, renders a <style> tag with the CSS content directly embedded.
+ * For external CSS files, renders a <link> tag pointing to the CSS file.
+ */
+export declare function renderCssResource(entryCssFiles: CssResource[], ctx: AppRenderContext, preloadCallbacks?: PreloadCallbacks): import("react").DetailedReactHTMLElement<{
+    key: number;
+    nonce: string | undefined;
+    precedence: string;
+    href: string;
+}, HTMLElement>[];