Fix logged out header for auto color mode

Simon Knoxrequested to merge
psi-token-header into master

What does this MR do and why?

Fix logged out header for auto color mode. Needed for Automatic mode for all (!167154 - closed)

Also use design tokens for rest of header.scss

How to set up and validate locally

  1. Browse as logged out user
  2. Browse as logged in user
  3. No strange colors in the header

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