The atmosphere is so bad around Megyn Kelly at “Today” that producers of the 7-to-9 a.m. slot, hosted by Savannah Guthrie and Hoda Kotb, are openly sniping at her. Kelly, who takes over “Today” at 9 a.m., had “congratulated” Kotb, “Mean Girls”-style, when the latter landed Matt Lauer’s job. On Jan. 2, Kelly said to Kotb, live on air, “We talked recently about how, 10 years ago, your life was very different. You were going through a dark period.”