Edinson Cavani was brought up to be hungry for more. As a boy playing for local club Nacional in his hometown of Salto in Uruguay, he was promised an ice cream if he scored the first and last goal in one of his team’s youth games. “We found a store 20m outside the ground,” he recalled to El País. “We went straight there with our parents. Me, I always got vanilla and dulce de leche.”   While it’s doubtful Cavani still indulges in the same post-match ritual, Chelsea will know ahead of their eagerly anticipated Champions League clash with Napoli that his appetite for finding the back of the net remains undiminished.   On Friday night, Cavani scored twice in an impressive 3-0 win…