fix: update Fliggy hackathon detail link to DingTalk docs

Author: TreeLin

_layouts/home.html

@@ -391,7 +391,7 @@ <h2>2026 飞猪 AI 旅行创新大赛</h2>
       </ul>
       <div class="hackathon-banner-actions">
         <a class="btn btn-primary" href="https://opc.aliyun.com/feizhu" target="_blank" rel="noopener">立即报名参赛</a>
-        <a class="btn btn-secondary" href="https://opc.aliyun.com/feizhu" target="_blank" rel="noopener">了解详情</a>
+        <a class="btn btn-secondary" href="https://alidocs.dingtalk.com/i/nodes/QG53mjyd800agdlKHebwk4Zj86zbX04v?spm=5176.46770457.J_EH4jTga-7kdox_HRccqIL.1.60017f64w8fosJ&iframeQuery=utm_source%3Dportal%26utm_medium%3Dportal_main_colum_create&rnd=0.503112500180594" target="_blank" rel="noopener">了解详情</a>
       </div>
     </div>
     <div class="hackathon-banner-card">