update demo

Author: lijunjie

demos/firered_chat/index.html

@@ -89,7 +89,8 @@ <h2>FireRedChat: A Pluggable, Full-Duplex Voice Interaction System with Cascaded
                 <div class="container pt-5 mt-5 shadow-lg p-5 mb-5 bg-white rounded">
                     <h2 id="Demo" style="text-align: center;">Demo</h2>
                         <p style="text-align: center;">
-                            <video src="https://github.com/FireRedTeam/fireredteam.github.io/raw/main/demos/firered_chat/video/chat.mp4" controls style="max-width:100%; height:auto;"></video>
+                            <video src="https://xhsci-qcsnet-redimage.xiaohongshu.com/mediaai/flash/fireredchat/chat_demo.mp4" controls style="max-width:100%; height:auto;"></video>
+                            <!-- <video src="https://github.com/FireRedTeam/fireredteam.github.io/raw/main/demos/firered_chat/video/chat.mp4" controls style="max-width:100%; height:auto;"></video> -->
                         </p>
                     <!-- <p style="text-align: center;">
                         <b>Figure 1.</b> FireRedChat System Modules.