feat: use bootstrap layout for forms

assets/app.js

@@ -0,0 +1,9 @@
+/*
+ * Welcome to your app's main JavaScript file!
+ *
+ * This file will be included onto the page via the importmap() Twig function,
+ * which should already be in your base.html.twig.
+ */
+import './styles/app.css';
+
+import 'bootstrap/dist/css/bootstrap.min.css';

assets/styles/app.css

@@ -0,0 +1,3 @@
+body {
+    background-color: skyblue;
+}