add: improved admin functions

front/src/pages/UsersPage.tsx

@@ -13,6 +13,9 @@ export default function UsersPage({socket}: {socket: WebSocket}) {
     const [thisUser, setThisUser] = useState<User>();
 
     function deleteUser(username: string) {
+        if (!window.confirm(`Are you sure you want to delete ${username}?`)) {
+            return;
+        }
         axios
             .post(`/api/users/${username}/delete`, { token })
             .catch((err) => {