docs: Update screenshots in README.md (#2220)

Author: wan92hen

README.md

@@ -35,12 +35,12 @@ Access MaxKB web interface at `http://your_server_ip:8080` with default admin cr
 
 <table style="border-collapse: collapse; border: 1px solid black;">
   <tr>
-    <td style="padding: 5px;background-color:#fff;"><img src= "https://github.com/1Panel-dev/MaxKB/assets/52996290/d87395fa-a8d7-401c-82bf-c6e475d10ae9" alt="MaxKB Demo1"   /></td>
-    <td style="padding: 5px;background-color:#fff;"><img src= "https://github.com/1Panel-dev/MaxKB/assets/52996290/47c35ee4-3a3b-4bd4-9f4f-ee20788b2b9a" alt="MaxKB Demo2"   /></td>
+    <td style="padding: 5px;background-color:#fff;"><img src= "https://maxkb.hk/images/overview.png" alt="MaxKB Demo1"   /></td>
+    <td style="padding: 5px;background-color:#fff;"><img src= "https://maxkb.hk/images/screenshot-models.png" alt="MaxKB Demo2"   /></td>
   </tr>
   <tr>
-    <td style="padding: 5px;background-color:#fff;"><img src= "https://github.com/1Panel-dev/MaxKB/assets/52996290/1c0c5e32-6194-47f9-bc32-487996349d9c" alt="MaxKB Demo3"   /></td>
-    <td style="padding: 5px;background-color:#fff;"><img src= "https://github.com/1Panel-dev/MaxKB/assets/52996290/f32f5fe9-a769-488c-ae0e-783bc2b89b3e" alt="MaxKB Demo4"   /></td>
+    <td style="padding: 5px;background-color:#fff;"><img src= "https://maxkb.hk/images/screenshot-knowledge.png" alt="MaxKB Demo3"   /></td>
+    <td style="padding: 5px;background-color:#fff;"><img src= "https://maxkb.hk/images/screenshot-function.png" alt="MaxKB Demo4"   /></td>
   </tr>
 </table>