feat: support embedded authoring for creation (#1741)

Adds support for creating documents and templates
using our embed components.

Support is super primitive at the moment and is being polished.

apps/remix/app/components/embed/embed-client-loading.tsx

@@ -1,7 +1,11 @@
+import { Loader } from 'lucide-react';
+
 export const EmbedClientLoading = () => {
   return (
     <div className="bg-background fixed left-0 top-0 z-[9999] flex h-full w-full items-center justify-center">
-      Loading...
+      <Loader className="mr-2 h-4 w-4 animate-spin" />
+
+      <span>Loading...</span>
     </div>
   );
 };