add referrals to courseapp

apps/course-app/src/app.html

@@ -35,6 +35,9 @@
 	<meta name="twitter:image" content="https://cdn.courseapp.oncws.com/courseapp-og.png" />
 
 	%sveltekit.head%
+
+	<script>(function (w, r) { w._rwq = r; w[r] = w[r] || function () { (w[r].q = w[r].q || []).push(arguments) } })(window, 'rewardful');</script>
+	<script async src='https://r.wdfl.co/rw.js' data-rewardful='d216d5'></script>
 </head>
 
 <body data-sveltekit-preload-data="hover">