The nephew of City Councilwoman Maria del Carmen Arroyo resigned Thursday as head of a Bronx charter school she helped fund - a day after he was charged with embezzlement. Richard Izquierdo Arroyo - who's also Assemblywoman Carmen Arroyo's grandson and chief of staff - Thursday notified the city he was resigning as chairman of the board of the South Bronx Charter School for International Culture and the Arts. His city councilwoman aunt sponsored $1.5 million in taxpayer funds this fiscal year to help build a permanent facility for the school, which is temporarily housed in a public school. The...