Maybe it’s the Jan. 6 mob attack on the U.S. Capitol and the subsequent House Committee hearings this past summer, but the idea of fleeing to the Forest of Arden has rarely been so enticing. Directors often reinvent it as a rowdy retreat, replete with music and dance, but in Lynnea Benson’s production of Shakespeare’s As You Like It, Arden is mellow, soft, and dappled in sylvan light (created by Dennis Parichy).