Small improvement: remove unnecessary login redirect

[msm-code]

Feature Category

• [ ] Correctness
• [x] User Interface / User Experience
• [x] Performance
• [ ] Other (please explain)

Describe the problem

When logging in, clicking the "login" button redirects to /auth and then immediately to the correct URL. This causes unnecessary screen flickering and bad UX.

Describe the solution you'd like

Just redirect directly to OIDC login url.

Describe alternatives you've considered

No reason to keep the current behaviour. Right now redirect to /auth is a nice trick to force login, but I don't think this is a very useful feature.