Renegade Nell is a puzzle. Boasting the creative pedigree of screenwriter Sally Wainwright (Gentleman Jack) and the talents of a cast of British TV stalwarts, the story of a flame-haired, 18th-century English highwaywoman with the powers of a 20th-century superhero would seem to be a shoo-in for the renfaire bitches (it’s me, I’m renfaire bitches).