chore(demo): update favicon

Author: rdlabo

demo/src/assets/favicon.png

@@ -12,7 +12,7 @@
     <meta name="format-detection" content="telephone=no" />
     <meta name="msapplication-tap-highlight" content="no" />
 
-    <link rel="icon" type="image/x-icon" href="favicon.ico" />
+    <link rel="icon" type="image/png" href="assets/favicon.png" />
 
     <!-- add to homescreen for ios -->
     <meta name="apple-mobile-web-app-capable" content="yes" />