wip: add relay discover to onboarding

src/app/auth/onboarding/index.tsx

@@ -0,0 +1,9 @@
+import { Outlet } from 'react-router-dom';
+
+export function OnboardingScreen() {
+  return (
+    <div className="flex h-full w-full items-center justify-center">
+      <Outlet />
+    </div>
+  );
+}