fix: add PNG favicon link to document layout

Author: yixuanwu4

apps/website/public/favicon.png

@@ -9,6 +9,7 @@ import "@fontsource-variable/montserrat";
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width" />
     <link rel="icon" href="/favicon.ico" type="image/x-icon" sizes="any" />
+    <link rel="icon" href="/favicon.png" type="image/png" />
     <link rel="icon" href="/favicon-16x16.png" type="image/png" sizes="16x16" />
     <link rel="icon" href="/favicon-32x32.png" type="image/png" sizes="32x32" />
     <link rel="icon" href="/favicon-48x48.png" type="image/png" sizes="48x48" />