add shadcn navigation-menu

components/Header.tsx

@@ -0,0 +1,25 @@
+'use client';
+
+import {
+  NavigationMenu,
+  NavigationMenuItem,
+  NavigationMenuLink,
+  NavigationMenuList,
+  navigationMenuTriggerStyle,
+} from '@/components/ui/navigation-menu';
+import Link from 'next/link';
+
+export function NavigationMenuDemo() {
+  return (
+    <NavigationMenu>
+      <NavigationMenuList>
+        <NavigationMenuItem>
+          <NavigationMenuLink
+            className={navigationMenuTriggerStyle()}
+            render={<Link href="https://docs.bitdori.org/">Docs</Link>}
+          />
+        </NavigationMenuItem>
+      </NavigationMenuList>
+    </NavigationMenu>
+  );
+}