* [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* [DOCS] Removed outdated index screenshot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] Subdivided getting started with ML pages
* [DOCS] Added new getting started page to build.gradle
Original commit: elastic/x-pack-elasticsearch@968187b048