Figuring they were ready to return to the playoffs, the Washington Capitals came up with a motto this fall to reflect that optimism: “New Look. New Season. New Attitude.” Well, 21 games in, it’s time to add this: “New Coach.” Owners of the NHL’s worst record and off to the franchise’s slowest start in 26 years, the Capitals fired Glen Hanlon on Thursday and replaced him on an interim basis with…