Celtic are champions and supporters spontaneously turned out at Celtic Park to celebrate the achievement and welcome the team back from their 5-0 victory at Rugby Park. Adam Idah, Daizen Maeda, James Forrest and Matt O’Riley were all on the scoresheet to punish Kilmarnock and sprint over the title-winning line on Wednesday night. Brendan Rodgers has guided the club to a third successive title after previous successes under Ange Postecoglou. It’s been a long, hard season but with the pressure really on this group of players have delivered. They’ve definitively proven they are the best team in S…