Change migrate-hosts to remove repository.d/hosts/fqdn

Create a backup, and drop that later.

refs #7398
Revamp sample configuration: add NodeName host, move services into apply rules schema

fixes #7594
Documentation: Rewrite getting started config section using apply rules

fixes #7504
Documentation: Better apply rule best practice in monitoring basics

fixes #7480
fixes #7543
fixes #7187
fixes #7573