Added excalidraw icon as application icon (#126)

public/index.html

@@ -12,7 +12,9 @@
       homescreen on Android. See https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/
     -->
     <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
-    <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico" />
+
+    <link rel="icon" href="%PUBLIC_URL%/logo.png" />
+    <!-- <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico" /> -->
     <link
       rel="preload"
       href="https://uploads.codesandbox.io/uploads/user/ed077012-e728-4a42-8395-cbd299149d62/AflB-FG_Virgil.ttf"