Draft: Don't build system or run morph on nodes.

I was trying to figure out how grids were deployed, and discovered that we run morph on the nodes. I assume that this so we can hard-code the grid that it is in[1].

Since we are running morph on the node we are installing on, we don't need its code to copy closures around, so it is possible to simply access the underlying nix expressions, and bypass running the morph command itself. This incidentally avoids the need to setup ssh for the deployment as well.