chore(governance): remove duplicated data (#5215)

Co-authored-by: Michael Esteban <[e-mail]>

CODE_OF_CONDUCT.md

···
+# Code of Conduct
+
+- [Node.js Code of Conduct](https://github.com/nodejs/admin/blob/HEAD/CODE_OF_CONDUCT.md)
+- [Node.js Moderation Policy](https://github.com/nodejs/admin/blob/HEAD/Moderation-Policy.md)

COLLABORATOR_GUIDE.md

···
 - [Issues and Pull Requests](#issues-and-pull-requests)
 - [Accepting Modifications](#accepting-modifications)
   - [Involving the Website Team](#involving-the-website-team)
-- [Developer's Certificate of Origin 1.1](#developers-certificate-of-origin-11)
-- [Code of Conduct](#code-of-conduct)
 - [Code editing](#code-editing)
   - [Adding new pages](#adding-new-pages)
     - [Create the page content](#create-the-page-content)
···
   actively participating in the discussion.
 
 The Website group should serve as the final arbiter where required.
-
-## Developer's Certificate of Origin 1.1
-
-By making a contribution to this project, I certify that:
-
-- (a) The contribution was created in whole or in part by me and I
-  have the right to submit it under the open source license
-  indicated in the file; or
-
-- (b) The contribution is based upon previous work that, to the best
-  of my knowledge, is covered under an appropriate open source
-  license and I have the right under that license to submit that
-  work with modifications, whether created in whole or in part
-  by me, under the same open source license (unless I am
-  permitted to submit under a different license), as indicated
-  in the file; or
-
-- (c) The contribution was provided directly to me by some other
-  person who certified (a), (b) or (c) and I have not modified
-  it.
-
-- (d) I understand and agree that this project and the contribution
-  are public and that a record of the contribution (including all
-  personal information I submit with it, including my sign-off) is
-  maintained indefinitely and may be redistributed consistent with
-  this project or the open source license(s) involved.
-
-## Code of Conduct
-
-This Code of Conduct is adapted from [Rust's wonderful
-CoC](https://github.com/rust-lang/rust/wiki/Note-development-policy#conduct).
-
-- We are committed to providing a friendly, safe and welcoming
-  environment for all, regardless of gender, sexual orientation,
-  disability, ethnicity, religion, or similar personal characteristic.
-- Please avoid using overtly sexual nicknames or other nicknames that
-  might detract from a friendly, safe and welcoming environment for
-  all.
-- Please be kind and courteous. There's no need to be mean or rude.
-- Respect that people have differences of opinion and that every
-  design or implementation choice carries a trade-off and numerous
-  costs. There is seldom a right answer.
-- Please keep unstructured critique to a minimum. If you have solid
-  ideas you want to experiment with, make a fork and see how it works.
-- We will exclude you from interaction if you insult, demean or harass
-  anyone. That is not welcome behavior. We interpret the term
-  "harassment" as including the definition in the [Citizen Code of
-  Conduct](http://citizencodeofconduct.org/); if you have any lack of
-  clarity about what might be included in that concept, please read
-  their definition. In particular, we don't tolerate behavior that
-  excludes people in socially marginalized groups.
-- Private harassment is also unacceptable. No matter who you are, if
-  you feel you have been or are being harassed or made uncomfortable
-  by a community member, please contact one of the channel ops or any
-  of the TC members immediately with a capture (log, photo, email) of
-  the harassment if possible. Whether you're a regular contributor or
-  a newcomer, we care about making this community a safe place for you
-  and we've got your back.
-- Likewise any spamming, trolling, flaming, baiting or other
-  attention-stealing behavior is not welcome.
-- Avoid the use of personal pronouns in code comments or
-  documentation. There is no need to address persons when explaining
-  code (e.g. "When the developer")
 
 ## Code editing