There will soon be a little less of Centennial to love — 18.03 acres less, to be exact. Next month, the city will bid goodbye to a parcel at the northwest corner of East Arapahoe Road and South Olathe Street that’s owned by Regis Jesuit High School. It will revert to Arapahoe County’s oversight in a rarely used legal process in Colorado known as municipal disconnection. Before year’s end, the largely vacant property is expected to be absorbed in…