Add functionality in logout button.

## Description
I have noticed that, on clicking the logout button, it redirects to /sad whereas there is no route mentioned in any of the files. This is an unusual behaviour of the link. Could you please check it out?

Thanks!

The issue reports that clicking the logout button redirects to /sad, but names no source file or test. Start by locating the logout button and the route definitions, then verify the intended post-logout destination and add coverage for the corrected redirect.

Written by the indexing model from the issue text.