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/esm/build/is-writeable.js

@@ -0,0 +1,11 @@
+import fs from 'fs';
+export async function isWriteable(directory) {
+    try {
+        await fs.promises.access(directory, (fs.constants || fs).W_OK);
+        return true;
+    } catch (err) {
+        return false;
+    }
+}
+
+//# sourceMappingURL=is-writeable.js.map