NEW YORK — Ghislaine Maxwell was sentenced 20 years in prison Tuesday for enabling Jeffrey Epstein’s serial abuse of underage girls for a decade. The former British socialite appeared in Manhattan federal court wearing a blue jail jumpsuit and shackles on her ankles. The steep prison term all but ensures Maxwell, described at trial as Epstein’s “lady of the house,” will remain imprisoned until her twilight years. “Today’s sentence holds Ghislaine Maxwell accountable for perpetrating heinous crimes against children. This sentence sends a strong message that no one is above the law and it is nev…