Move the voting API under one route

Instead of /submit and /view, it's either a GET or POST request against
/votes/:slug.

src/main.rs

@@ -73,8 +73,8 @@ async fn main() {
     };
 
     let app = Router::new()
-        .route("/votes/submit/:slug", post(leaderboard_submit_score))
-        .route("/votes/view/:slug", get(view_votes))
+        .route("/votes/:slug", post(leaderboard_submit_score))
+        .route("/votes/:slug", get(view_votes))
         .with_state(initial_state.clone());
 
     let addr = SocketAddr::from(([127, 0, 0, 1], 3000));