Lady Antebellum’s Charles Kelley and wife Cassie recently sold their Nashville home for $2.91 million in an off-market deal, according to ArchitecturalDigest.com. Charles and Cassie bought the 6,218-square-foot house in 2012 for $1.6 million. The five-bedroom, six-bath, two-story Georgian home, which was recently renovated by Ridley Wills Co., features an open kitchen, pool, pool house,…