Moved env checks to server pages.

src/app/logout/page.tsx

@@ -2,6 +2,10 @@ import LogoutPage from './LogoutPage';
 import { Metadata } from 'next';
 
 export default function () {
+  if (process.env.DISABLE_LOGIN) {
+    return null;
+  }
+
   return <LogoutPage />;
 }