Update React Editor integration and clean up template

app/policies/[handle]/editor/page.tsx

@@ -1,9 +1,8 @@
 import PageEditor from '@/components/page-editor';
 import pageData from '../page.json';
 
-// Editor for /policies/[handle]. Sitting under the route it edits means the preview
-// resolves the same params the public page gets, and `../page.json` is the
-// very file publishing writes back to.
 export default function EditorPage() {
-  return <PageEditor routeKey="/policies/[handle]" page={pageData} />;
+  return (
+    <PageEditor pagePath="app/policies/[handle]/page.json" page={pageData} />
+  );
 }