They used to look like quagmires, ice rinks or dustbowls, depending on the time of year. But as big money entered football, pristine pitches became crucial to the sport’s image – and groundskeepers became stars. By William Ralston. Help support our independent journalism at <a href="https://www.theguardian.com/footballweeklypod">theguardian.com/footballweeklypod</a>