Add possibility to go back the the home/login page

When logged in, it is not possible to go back to the home/login page without logging out. As the home page contains some important links (user guide, contact us page), there should be a way to get to these links easily, if not by being able to go back to the home page.

No file or test is named. Start by tracing the logged-in page navigation and the home/login page entry point; the work is done when a logged-in user can reach the home page and its user guide and contact links without logging out.

Written by the indexing model from the issue text.