Reset user in redux on logout.

pages/logout.js

@@ -1,12 +1,16 @@
 import { useEffect } from 'react';
+import { useDispatch } from 'react-redux';
 import { useRouter } from 'next/router';
 import { get } from 'lib/web';
+import { updateUser } from 'redux/actions/user';
 
 export default function LogoutPage() {
+  const dispatch = useDispatch();
   const router = useRouter();
   const { basePath } = router;
 
   useEffect(() => {
+    dispatch(updateUser(null));
     get(`${basePath}/api/auth/logout`).then(() => router.push('/login'));
   }, []);