Talk about living off the grid. About 25 years ago, Mick Dodge shed his shoes, grew his beard, and left modern civilization (and a family) to live alone in the Pacific Northwest’s Hoh rain forest. But he’s not a total isolationist; he’s dialed into a community of mountain dwellers and agreed (although it took convincing) to be the subject of National Geographic Channel’s series “The Legend of Mick Dodge,” which premieres with two consecutive episodes on Jan. 7.