Add missing favicon link in index.html

Author: Sumit189

index.html

@@ -7,6 +7,7 @@
     <meta name="theme-color" content="#69A5A1" />
     <link rel="manifest" href="./manifest.webmanifest" />
     <link rel="apple-touch-icon" href="assets/logo.png" />
+    <link rel="icon" type="image/png" href="assets/logo.png" />
     <meta name="apple-mobile-web-app-capable" content="yes" />
     <meta name="apple-mobile-web-app-status-bar-style" content="default" />
     <link rel="stylesheet" href="./styles.css" />