Confirmation page and minor improvements to homepage and form messages

Basic redirect with flash messages for success and error messages

src/startup.rs

@@ -127,7 +127,6 @@ pub fn app(
         .layer(middleware::from_fn(require_auth));
     Router::new()
         .route("/", get(home))
-        .route("/register", get(register))
         .route("/login", get(get_login).post(post_login))
         .route("/health_check", get(health_check))
         .route("/subscriptions", post(subscribe))