[FEATURE]: Add configuration option to always hide the header

[jasonish]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

This feature has had similar requests before, but has usually been larger in scope.

Commit 2bb299d added auto-hiding of the header. But having it always hidden is very valuable on smaller terminals, or even larger ones, for those who value vertical space.

[jasonish]

Fixed by #13244.