Merge pull request #2023 from infosiftr/nuxeo

Add Nuxeo deprecation notice

nuxeo/README-short.txt

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-Nuxeo is an open source Content Management Platform that is completely customizable.
+DEPRECATED; contact Nuxeo for support/updates

nuxeo/deprecated.md

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+This image is deprecated, as the Nuxeo-maintained images are now private ([docker-library/official-images#6127 (comment)](https://github.com/docker-library/official-images/pull/6127#issuecomment-912530080)). For further support, contact [Nuxeo](https://www.nuxeo.com/).