Make bind tutorial more clear about where to place artifact

[byorgey]

I had a student who was confused about where exactly they were supposed to place the artifact. It just says you should place it "on the pedestal" but it is not completely obvious that "on the pedestal" means "in the center of the gray area". (My student was trying to place it north of the gray area, as if it were a side view of a pedestal.) Since this is not the purpose of the tutorial there is no reason not to 100% explicitly spell out where the artifact should be placed.

I am imagining something like making the central square a different color, and then saying in the goal description something like "on top of the pedestal, on the blue square" or something like that.