update readme.md url into deploy

[waltribeiro]

fixed metal to deploy

[displague]

I don't think we want to update the links and give the impression that this repo is actively maintained.
That said, I could see taking this update at the same time as an update that applied #136, as the final steps in the archival of this repo.

The eventual successor to this project is equinix/equinix-sdk-python#5