Update favicon.png

lightrag_webui/index.html

@@ -5,7 +5,7 @@
     <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
     <meta http-equiv="Pragma" content="no-cache" />
     <meta http-equiv="Expires" content="0" />
-    <link rel="icon" type="image/svg+xml" href="icon.svg" />
+    <link rel="icon" type="image/png" href="favicon.png" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Lightrag</title>
   </head>