Remove redemption page header and footer

internal/site/assets/index.html

@@ -10,10 +10,6 @@
     <script src="/app.js" defer></script>
   </head>
   <body>
-    <header class="nav">
-      <a class="brand" href="/">X<span class="brand-dot">✦</span>GIFT</a
-      ><span class="eyebrow">A LITTLE MORE PREMIUM</span>
-    </header>
     <main class="landing">
       <section class="intro">
         <div class="pill"><span class="dot"></span> PREMIUM GIFT</div>
@@ -137,9 +133,5 @@
         </div>
       </section>
     </main>
-    <footer>
-      <span>XGift · 把 Premium 赠予你</span
-      ><span>独立兑换服务，与 X 无隶属关系</span>
-    </footer>
   </body>
 </html>