Consider running ansible locally on each system

In my personal use of Ansible, I've found that even with all the ssh optimizations like persistent connections being used, it's still a lot faster to run ansible locally with `ansible_connection=local` than over ssh from another system.

It might be more trouble to do it that way for our deploys than it's worth, but I think we should consider the possibility. I think the faster we can make our deploys, the better.

Start by examining how this repository currently runs Ansible during deploys, then compare local execution using ansible_connection=local with the existing SSH-based approach. Determine whether local execution is practical for these deploys and define completion as an agreed implementation or a documented decision with measured performance trade-offs.

Written by the indexing model from the issue text.