Kit Harrington, the actor who brought Jon Nieve to life for eight seasons, has just shared a story that leaves little room for light gossip. He entered rehabilitation just as the first chapter of the last season of ‘Game of Thrones’ reached the screens. The confession, collected in a new interview, breaks with the image of an untouchable hero and shows the darkest part of a fame that almost devours him. “The first thing I did while the series wa…