Remove md5.js dependency

Switch to the built-in WebCrypto APIs for computing identicon hashes.

src/static/templates/admin/organizations.hbs

@@ -73,9 +73,11 @@
         return false;
     }
 
-    document.querySelectorAll("img.identicon").forEach(function (e, i) {
-        e.src = identicon(e.dataset.src);
-    });
+    (async () => {
+        for (let e of document.querySelectorAll("img.identicon")) {
+            e.src = await identicon(e.dataset.src);
+        }
+    })();
 
     document.addEventListener("DOMContentLoaded", function(event) {
         $('#orgs-table').DataTable({
@@ -87,4 +89,4 @@
             ]
         });
     });
-</script>
+</script>