Remove variables that only exist in GOV.UK template
Remove variables that only exist in GOV.UK template

$grey-8 is defined in the template as $footer-background.

This base file assumes that GOV.UK elements is being used without
GOV.UK template, remove the template-specific background colour and
instead set it to $white, matching the body background.

gavboulton/govuk_elements,gavboulton/govuk_elements,alphagov/govuk_elements,alphagov/govuk_elements,gavboulton/govuk_elements,joelanman/govuk_elements,alphagov/govuk_elements,alphagov/govuk_elements,joelanman/govuk_elements,gavboulton/govuk_elements