Update node-packages-generated to latest npm2nix format

Signed-off-by: Shea Levy <shea@shealevy.com>
Handle peerDependencies in nodePackages

Signed-off-by: Shea Levy <shea@shealevy.com>
Add yo nodePackage

Signed-off-by: Shea Levy <shea@shealevy.com>