...issue by deleting the session cookie after successful password change
and forcing the user to re-authenticate.
additionally, split the InitialPasswordChange func into separate "GET"
and "POST" variants.
* add user onboarding workflow
* fix user editing (no edits of passwords of regular users after
onboarding)
* refresh HIBP breach cache in DB on app start-up
* display HIBP breach details
* fix request scheduling to prevent panics (this still needs some love..)
* fix middleware auth
* add TODOs
* update head.tmpl
* reword some error messages