feat(docs): enhance documentation site with internationalization and layout updates

- Updated the demo API to support locale-based content rendering.
- Refactored the main layout to accommodate language-specific metadata and routing.
- Introduced new components for blog and documentation pages, ensuring proper language handling.
- Added styles for improved UI consistency across different sections.
- Removed deprecated layout files and streamlined the structure for better maintainability.

apps/docs/app/[lang]/(home)/layout.tsx

@@ -0,0 +1,18 @@
+import { HomeLayout } from 'fumadocs-ui/layouts/home';
+import { baseOptions } from '@/lib/layout.shared';
+import { isLanguage, i18n } from '@/lib/i18n';
+
+export default async function Layout({ params, children }: LayoutProps<'/[lang]'>) {
+  const { lang } = await params;
+  const base = baseOptions(isLanguage(lang) ? lang : i18n.defaultLanguage);
+
+  return (
+    <HomeLayout
+      {...base}
+      nav={{ ...base.nav, transparentMode: 'always' }}
+      className="home-fullbleed-nav"
+    >
+      {children}
+    </HomeLayout>
+  );
+}