Properly promote this repo

@ayufan is this repo linked from a prominent place? (Runner readme or so)

@sytses It's currently exposed in main readme of runner: https://gitlab.com/gitlab-org/gitlab-ci-multi-runner#cleaning-docker-images-automatically

It will get nice place when I finish the documentation for Docker executor. It will be put into administrative guide for this executor.

@ayufan OK, thanks

the link is dead, and search in new renamed repo doesn't yield also anything

https://gitlab.com/search?project_id=250833&scope=blobs&search=cleaning+docker+images+automatically