Every fall, Deer Isle roads are scattered with apples from old trees that have steadily produced fruit for decades. It’s likely that more deer eat them than people these days, resident René Colson guesses, but apples were once a key part of life and community on the island of Deer Isle-Stonington. Now, she and other members of the new Deer Isle Apple Corps are on a mission to preserve aging trees before they die out, discover more about their my…