Docs: Improve remote image renderer documentation (#20031)
Docs: Improve remote image renderer documentation (#20031)

* Add docker-compose example for running grafana with remote renderer

* Update docs/sources/administration/image_rendering.md

Co-Authored-By: Marcus Efraimsson <c11bb2318bc5401baeed0fcccbc65cd156dad485@gmail.com>
grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana