Resolve "Clicking on logo after login"

What does this MR do?

The homepage now redirects users based on their role:

• admins are redirected to /admin
• guests are redirected to /guest
• unauthenticated users see the general homepage

Does this MR meet the acceptance criteria?

• I have added tests to validate the new functionality.
• I have updated the documentation accordingly.
• I have added translations for all new client-side text.