WIP: Remove the docs lint Dockerfile

Achilleas Pipinellisrequested to merge
rm-docs-lint into master

We'll move this over the gitlab-docs project https://gitlab.com/gitlab-com/gitlab-docs/issues/306. Part of gitlab-com&34 (closed).

The image itself should not be removed, as it will be used by the previous stable branches.

Edited by Achilleas Pipinellis

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