Rewrite the style classes of a FontAwesome icon class list to the given
style, e.g. fas fa-user -> fa-duotone fa-light fa-user.
Brand icons are never rewritten: their glyphs only exist in the brands
family, so forcing a style would blank them. Everything that isn't a style
class — the icon name and any utility classes — passes through untouched.
Rewrite the style classes of a FontAwesome icon class list to the given style, e.g.
fas fa-user->fa-duotone fa-light fa-user.Brand icons are never rewritten: their glyphs only exist in the brands family, so forcing a style would blank them. Everything that isn't a style class — the icon name and any utility classes — passes through untouched.