Merge pull request #473 from infosiftr/docker-dev

Officially deprecate the "docker-dev" image in favor of the "dockercore/docker" automated build

docker-dev/deprecated.md

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+This image is officially deprecated in favor of [the `dockercore/docker` automated build](https://hub.docker.com/r/dockercore/docker/), and will receive no further updates. Please adjust your usage accordingly.