Denver-based eyewear company Navajo Incorporated has acquired the Monument-based sunglasses company that made a name for itself by selling $20 "high definition" sunglasses. Navajo has purchased Maxx HD Sunglasses, a distributor of sports, motorsports and NCAA-licensed sunglasses. The purchase price was not disclosed. Maxx was founded in 2000 by Rick and Nancy Milner, who launched what is now a multi-million sunglasses company after they hawked sunglasses under a yellow tent on the side of the road.…