Implement redux.

pages/api/auth/logout.js

@@ -0,0 +1,16 @@
+import { serialize } from 'cookie';
+import { AUTH_COOKIE_NAME } from 'lib/constants';
+
+export default async (req, res) => {
+  const cookie = serialize(AUTH_COOKIE_NAME, '', {
+    path: '/',
+    httpOnly: true,
+    maxAge: 0,
+  });
+
+  res.statusCode = 303;
+  res.setHeader('Set-Cookie', [cookie]);
+  res.setHeader('Location', '/login');
+
+  return res.end();
+};