Show an alert when we click the "login" button.

Yay, user interactivity.

src/App.tsx

@@ -40,7 +40,7 @@ const App = () => {
 
 	return (
 		<div className="App">
-			{state ? <p>{state.username}</p> : <AuthModal></AuthModal>}
+			{state ? <p>{state.username}</p> : <AuthModal doLogin={() => alert("login")}></AuthModal>}
 		</div>
 	);
 };