Squeezed between the Harlem River and the old Yankee Stadium lies the mostly forgotten neighborhood of Mott Haven. For decades, this South Bronx community has borne the brunt of crime, drugs and poverty in a city known for its luxuriously rich and desperately poor. Mott Haven is a hodge-podge of storefronts, public housing, abandoned buildings and turn-of-the-century brownstones and recently…