docs: update index.html

Author: ChenZiHong-Gavin

index.html

@@ -169,9 +169,6 @@ <h1>🎯 Weekly Vibe Coding</h1>
                 <span class="app-status status-live">✅ 已部署</span>
             </a>
 
-        </div>
-
-        <div>
             <a href="https://chenzihong-gavin.github.io/weekly-vibe-coding/spin-art/" class="app-card" target="_blank">
                 <div class="app-icon">🎨</div>
                 <div class="app-title">Spin Art</div>