B2B-88: add starter kit structure and elements

app/home/(user)/billing/error.tsx

@@ -0,0 +1,7 @@
+'use client';
+
+// We reuse the page from the billing module
+// as there is no need to create a new one.
+import BillingErrorPage from '~/home/[account]/billing/error';
+
+export default BillingErrorPage;