update community link

README.md

@@ -19,8 +19,8 @@ language:
 
 <div align="center">
   ｜<a href="https://github.com/hpcaitech/ColossalAI/tree/main/applications/Colossal-LLaMA-2" target="_blank">🔥 GitHub </a> | 
-  <a href="https://github.com/baichuan-inc/Baichuan-7B/blob/main/media/wechat.jpeg?raw=true" target="_blank">😊 Slack</a>｜
-  <a href="https://github.com/baichuan-inc/Baichuan-7B/blob/main/media/wechat.jpeg?raw=true" target="_blank">💬 WeChat</a>｜
+  <a href="https://github.com/hpcaitech/public_assets/tree/main/colossalai/contact/slack" target="_blank">😊 Slack</a>｜
+  <a href="https://raw.githubusercontent.com/hpcaitech/public_assets/main/colossalai/img/WeChat.png" target="_blank">💬 WeChat</a>｜
 </div>
 
 <div align="center">