Rocket: Use fairings for routes of sub-files

Instead of adding all routes manually in the Launch function for Rocket,
implement fairings for all the different files that adds the routing to
the rocket in a self-contained manner.

src/main.rs

@@ -36,13 +36,11 @@ async fn index(mut db: Connection<Db>) -> Redirect {
 fn rocket() -> _ {
     rocket::build()
         .mount("/", FileServer::from(relative!("static_files")))
-        .mount("/", routes![index,
-            vote::fetch_vote_data, vote::vote,
-            truth::create_truth, truth::edit_truth,
-            week::week, week::update_week, week::set_last_week, week::create_week,
-            auth::login, auth::logout])
+        .attach(auth::stage())
+        .attach(week::stage())
+        .attach(truth::stage())
+        .attach(vote::stage())
+        .mount("/", routes![index])
         .attach(database::stage())
         .attach(Template::fairing())
 }
-
-// TODO: Random Row ID