docs: Remove obsolete Ansible rule (#10689)
docs: Remove obsolete Ansible rule (#10689)

According to the author, the Ansible role is obsolete:
https://github.com/picotrading/ansible-grafana/issues/8#issuecomment-342210822
As the proposed alternative (https://github.com/jtyr/ansible-grafana/) hasn't been updated in the last two years either, I'm suggesting it should be removed altogether in favor of the role maintained by cloudalchemy.
grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana