OverState System deprecated

[louwers]

The readme still mentions the OverState System even though it is deprecated. https://docs.saltstack.com/en/latest/topics/orchestrate/orchestrate_runner.html#orchestrate-runner

[myii]

@louwers Thanks for the notice. Actually, the plan is to completely revamp this formula as outlined in #8. So OverState will be replaced as part of that process.