Refactor navigation routes to include prefix and add new page components for admin hub, game lobby, game type, join private game, manage private subtask, manage subgroups, and team

app/(routes)/index.tsx

@@ -0,0 +1,6 @@
+import { Redirect } from "expo-router";
+
+export default function Index() {
+  return <Redirect href="/login" />;
+}
+