Revert "Unify workspace dropdowns; Update layouts (#458)"

This reverts commit 4bc8448a1d.

apps/web/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;