Tonight’s Riverdale episode can be described in three words: Calm. Down. Archie. Seriously, homeboy—as Bella Hadid would call him—is pressed. Here’s why (spoilers ahead)… To start, everyone in Riverdale is freaking out about the Black Hood. Jughead checks out a zillion books about serial killers; Archie’s shooting bullets into trees; and Queen Cheryl Blossom doesn’t…