Revert "make target to send key to pgp.mit.edu"

This reverts commit 9a6b6a32e87894f36c490bac2d3a64937418b1ac.
Revert "send key to pgp.mit.edu when publishing a signed artifact"

This reverts commit a8d0bead2ad62b384f078a24936db27fff034b6f.