chore: replace clarify with umami, defer js on page

apps/classroomio-com/src/app.html

@@ -46,15 +46,9 @@
   <link rel="icon" type="image/png" href="/favicon.ico" />
   <link rel="icon" type="image/png" sizes="32x32" href="/logo-32.png" />
 
-  <script type="text/javascript">
-    (function (c, l, a, r, i, t, y) {
-      c[a] = c[a] || function () { (c[a].q = c[a].q || []).push(arguments) };
-      t = l.createElement(r); t.async = 1; t.src = "https://www.clarity.ms/tag/" + i;
-      y = l.getElementsByTagName(r)[0]; y.parentNode.insertBefore(t, y);
-    })(window, document, "clarity", "script", "mh3jo89whr");
-  </script>
+  <script defer src="https://cloud.umami.is/script.js" data-website-id="efd70f1f-1f2e-4513-a1dd-ba7826fec138"></script>
 
-  <script type="text/javascript">
+  <script defer type="text/javascript">
     window.$crisp = [];
     window.CRISP_WEBSITE_ID = '69176b47-5f63-42cc-bb9b-68d4927b6276';
     (function () {
@@ -66,7 +60,7 @@
     })();
   </script>
 
-  <script type="text/javascript">
+  <script defer type="text/javascript">
     (function (C, A, L) {
       let p = function (a, ar) {
         a.q.push(ar);