chore(cleanup): moved pong.css to pong directory

frontend/index.html

@@ -57,7 +57,6 @@
 	<script type="module" src="/src/routing"></script>
 	<script type="module" src="/src/toast"></script>
 	<script type="module" src="/src/auth"></script>
-	<script type="module" src="/src/pong/"></script>
 </body>
 
 </html>

frontend/src/pages/pong/pong.ts

@@ -6,6 +6,7 @@ import { showError, showInfo } from "@app/toast";
 import { getUser, type User } from "@app/auth";
 import { isNullish } from "@app/utils";
 import client from "@app/api";
+import "./pong.css";
 
 // get the name of the machine used to connect
 declare module 'ft_state' {

frontend/src/pong/index.ts

@@ -1 +0,0 @@
-import './pong.css';