make sign in with ion link a button

src/components/Home.tsx

@@ -1,4 +1,5 @@
 import { ION_AUTHORIZATION_ENDPOINT } from '../api';
+import Button from '@material-ui/core/Button';
 
 export default function Home() {
 	return (
@@ -11,7 +12,11 @@ export default function Home() {
 		>
 			<h1>Home</h1>
 			<div style={{ display: 'flex', flexDirection: 'row' }}>
-				<a href={ION_AUTHORIZATION_ENDPOINT}>Log In with Ion</a>
+				<Button
+					onClick={() => (window.location.href = ION_AUTHORIZATION_ENDPOINT)}
+				>
+					Sign In with Ion
+				</Button>
 			</div>
 		</div>
 	);