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/web/get-edge-preview-props.d.ts

@@ -0,0 +1,10 @@
+/**
+ * In edge runtime, these props directly accessed from environment variables.
+ *   - local: env vars will be injected through edge-runtime as runtime env vars
+ *   - deployment: env vars will be replaced by edge build pipeline
+ */
+export declare function getEdgePreviewProps(): {
+    previewModeId: string;
+    previewModeSigningKey: string;
+    previewModeEncryptionKey: string;
+};