Two baby-faced Westchester arsonists who admitted to torching a beloved Hudson River lighthouse will get to avoid jail time thanks to a plea deal that allows them to buy their freedom. Elvin Ayavaca, 19, and Richard Joseph Barrero, 20, both pleaded guilty on Monday in exchange for a sweetheart deal that allows the arsonists to dodge any time in prison — as long as they cough up nearly $81,000 each and stay out of trouble for the rest of the year, according to the Westchester DA’s office. If the pair, who caused roughly $100,000 in damage to Westchester’s historic Tarrytown...