* [DOCS] Refresh screenshots in ML tutorial
* [DOCS] Refreshed screenshots for single metric job
* [DOCS] Removed outdated index screenshot
Original commit: elastic/x-pack-elasticsearch@14f39c3091
* [DOCS] Add role info to ML getting started docs
* [DOCS] Getting started with sample ML data
* [DOCS] Getting started with server-metrics sample data
Original commit: elastic/x-pack-elasticsearch@2f268f87b4