feat(onboard): implement onboarding routes

src/routes/onboard/hello.rs

@@ -1,7 +1,10 @@
 use rauth::entities::Session;
+use revolt_quark::models::User;
 use rocket::serde::json::Value;
 
 #[get("/hello")]
-pub async fn req(/*_session: Session, user: Option<User>*/) -> Value {
-    todo!()
+pub async fn req(_session: Session, user: Option<User>) -> Value {
+    json!({
+        "onboarding": user.is_none()
+    })
 }