add a cheeky icon

sub sandwhich  = pubsub right?

Author: NeoScript

webapp/src/assets/icon.png

@@ -5,7 +5,11 @@
   <title>pubsub-ui</title>
   <base href="/">
   <meta name="viewport" content="width=device-width, initial-scale=1">
-  <link rel="icon" type="image/x-icon" href="favicon.ico">
+  <link rel="icon" type="image/x-icon" href="assets/icon.png">
+
+  <!-- icon source -->
+  <!-- <a href="https://www.flaticon.com/free-icons/food-and-restaurant" title="food and restaurant icons">Food and restaurant icons created by Nikita Golubev - Flaticon</a> -->
+
   <link rel="preconnect" href="https://fonts.gstatic.com">
   <!-- <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500&display=swap" rel="stylesheet"> -->
   <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">