Update giftcard deeplink page layout

src/app/giftcards/[uuid]/deeplink/page.tsx

@@ -2,9 +2,18 @@ import React from 'react';
 
 export default function Page() {
   return (
-    <div>
-      <h1>Giftcard</h1>
-      <p>Giftcard page</p>
+    <div className='w-screen text-center'>
+      <h3 className='text-lg mt-4 font-bold text-black'>
+        기프트허브가 실행되지 않나요?
+      </h3>
+      <p className='text-sm mt-4 text-gray-500'>
+        기프트허브 앱을 설치하거나
+        <br />
+        최신버전으로 업데이트 해주세요.
+      </p>
+      <button className='mt-4 w-48 h-12 bg-red-500 rounded text-white'>
+        다운로드
+      </button>
     </div>
   );
 }