automatically clean up old deploys

[rlskoeser]

Is your feature request related to a problem? Please describe.
Currently, the deploy scripts leave all past deploys sitting in the directory.

Describe the solution you'd like
Old deploys should automatically be cleaned up when the deploy finishes. Maybe keep the last 3 based on date (most recent)? Should always preserve current + previous.

See for one possible solution https://www.future500.nl/articles/2014/07/thoughts-on-deploying-with-ansible/

Describe alternatives you've considered
Could be cleaned up manually or by a cron job, but seems better to make it part of the deploy.