After login, the user has no option to close the session and logout. To login we use the built-in view [django.contrib.auth.login](https://docs.djangoproject.com/en/5.1/topics/auth/default/#django.contrib.auth.login), so we need to use [django.contrib.auth.logout](https://docs.djangoproject.com/en/5.1/topics/auth/default/#how-to-log-a-user-out) for this feature. Add the Logout link in the navigation bar (nav.html)