Drone company DJI unveiled Tuesday a new foldable, portable drone called the Mavic Air. The Mavic Air, which sits in the company’s lineup between the entry-level DJI Spark and prosumer Mavic Pro series, will begin shipping on Jan. 28 for $799. The Mavic Air packs a 1/2.3″ CMOS sensor and an f/2.8 aperture lens capable …