Source: Unsplash For the better part of a decade, Rotherham United have been the very definition of a yo-yo club. Between 2016 and 2022, the Millers didn't play two consecutive seasons in the same division. They were either promoted from League One or relegated from the Championship. Last term, however, that came to an end. The club lost long-term manager and club legend Paul Warne at the beginning of last season, with the club's former striker, fitness coach, and eventually…