In a small saucepan, over medium heat, bring the coconut milk to a simmer. Remove the pot from the stove and add the chocolate. Let the chocolate sit (without stirring) while grating the orange zest. When you have finished grating the zest, stir the chocolate and coconut milk until a silky ganache forms. Add the salt, orange zest, vanilla, and maple syrup and mix well. Pour the filling into the baked crust and let it cool to room temperature. Place the cooled tart into the fridge until the filling is firm. Top with whatever garnishes you wish, serve, and enjoy! Store the remaining tart (if there is any) in the refrigerator.