* Add basalt-is-a-thunk support to home-manager
* Rename self-update to git-hook-impls for home-manager
  * Add a symlink for backward compatibility, which will be needed when someone updates to this version of basalt
* Reverse the direction of the git-hook-impls and git-hooks backward compatibility symlinks
* Use target/nixos in the nixos scripts rather than the backward compatibility symlinks