HFI Calc: Remove Sign Out

**As a** User Type/Persona

**I need** Feature/enhancement

**So That** Value, why is this needed, what does the user need to accomplish

**Acceptance Criteria**
- Signout removed
- [ ] Given (Context), When (action carried out), Then (expected outcome)

**Additional Context**
- enter text here
- enter text here

**Definition of Done**
https://github.com/bcgov/wps/wiki/Definition-of-Done

The issue names HFI Calc but provides no file, test, or entry point. Start by locating the sign-out flow and confirm the expected behavior with a maintainer; done means signout is removed and the acceptance criterion is verified.

Written by the indexing model from the issue text.