Update for DCO

CONTRIBUTING.md

+## Developer Certificate of Origin + License
+
+By contributing to GitLab B.V., You accept and agree to the following terms and
+conditions for Your present and future Contributions submitted to GitLab B.V.
+Except for the license granted herein to GitLab B.V. and recipients of software
+distributed by GitLab B.V., You reserve all right, title, and interest in and to
+Your Contributions. All Contributions are subject to the following DCO + License
+terms.
+
+[DCO + License](https://gitlab.com/gitlab-org/dco/blob/master/README.md)
+
 ## Contributing
 You can help to improve the [about.gitlab.com](https://about.gitlab.com/) website by sending merge requests to this repository.
@@ -10,14 +21,6 @@ If you submit blog post contributions, those contributions are also governed by
 For more information about the technicalities of contributing please see the [README](README.md).
-## Contributor license agreement
-
-By submitting code as an individual you agree to the [individual contributor
-license agreement][individual-agreement].
-
-By submitting code as an entity you agree to the [corporate contributor license
-agreement][corporate-agreement].
-
 ## Code of conduct
 As contributors and maintainers of this project, we pledge to respect all people
@@ -47,6 +50,4 @@ reported by emailing contact@gitlab.com.
 This Code of Conduct is adapted from the [Contributor Covenant][contributor-covenant], version 1.1.0,
 available at [http://contributor-covenant.org/version/1/1/0/](http://contributor-covenant.org/version/1/1/0/).
-[contributor-covenant]: http://contributor-covenant.org
-[individual-agreement]: https://docs.gitlab.com/ee/legal/individual_contributor_license_agreement.html
-[corporate-agreement]: https://docs.gitlab.com/ee/legal/corporate_contributor_license_agreement.html
+[contributor-covenant]: http://contributor-covenant.org
\ No newline at end of file