WIP: Remove the docs lint Dockerfile
We'll move this over the gitlab-docs project https://gitlab.com/gitlab-com/gitlab-docs/issues/306. Part of gitlab-com&34.
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Merge after https://gitlab.com/gitlab-com/gitlab-docs/issues/306 is resolved.
The image itself should not be removed, as it will be used by the previous stable branches.
Edited by Achilleas Pipinellis