feat: add basic webui

apps/email-playground/emails/contact.tsx

@@ -0,0 +1,11 @@
+import { ContactTemplate } from '@konobangu/email/templates/contact';
+
+const ExampleContactEmail = () => (
+  <ContactTemplate
+    name="Jane Smith"
+    email="jane.smith@example.com"
+    message="I'm interested in your services."
+  />
+);
+
+export default ExampleContactEmail;