i15-1: When logged out, there is a redirect to Keycloak screen from child pages

[zoharma]

When a user is logged out they can access the root page and go to other pages.

When trying to get to some pages directly (or refresh), the page redirects to the identity page.

To recreate:

1. Open an incognito screen and go to https://i15-1.diamond.ac.uk/
2. Go to Acquisition -> Robot and hit refresh or go directly to https://i15-1.diamond.ac.uk/acquisition/robot

Expected behaviour:

See screens with limited functionality.