Update index.html

Author: zinengtang

index.html

@@ -52,7 +52,7 @@
         <table style="width:100%;border:0;border-collapse:collapse;border-spacing:0;margin-right:auto;margin-left:auto;"><tbody>
 		<tr style="vertical-align:left;">
 			    <td style="padding:30px;width:35%;vertical-align:center">
-				  <img src='images/codi.png' width="250">
+				  <img src='images/codi.jpg' width="250">
 			    </td>
 			  <td style="padding:30px;width:75%;vertical-align:center">
 				<a href="https://arxiv.org/abs/2305.11846">