chore(doc): implement remainder of documentation

src/routes/onboard/hello.rs

@@ -1,10 +1,22 @@
 use rauth::entities::Session;
 use revolt_quark::models::User;
-use rocket::serde::json::Value;
+use rocket::serde::json::Json;
+use serde::Serialize;
 
+/// # Onboarding Status
+#[derive(Serialize, JsonSchema)]
+pub struct DataHello {
+    /// Whether onboarding is required
+    onboarding: bool,
+}
+
+/// # Check Onboarding Status
+///
+/// This will tell you whether the current account requires onboarding or whether you can continue to send requests as usual. You may skip calling this if you're restoring an existing session.
+#[openapi(tag = "Onboarding")]
 #[get("/hello")]
-pub async fn req(_session: Session, user: Option<User>) -> Value {
-    json!({
-        "onboarding": user.is_none()
+pub async fn req(_session: Session, user: Option<User>) -> Json<DataHello> {
+    Json(DataHello {
+        onboarding: user.is_none(),
     })
 }