doc: merge CODE_OF_CONDUCT.md and coc.md

Merged the CODE_OF_CONDUCT.md and doc/guides/contributing/coc.md
files into a single code of conduct file

Refs: nodejs#31741

CODE_OF_CONDUCT.md

@@ -1,4 +1,44 @@
 # Code of Conduct
 
-* [Node.js Code of Conduct](https://github.com/nodejs/admin/blob/master/CODE_OF_CONDUCT.md)
+The Node.js project has a [Code of Conduct][] that *all* contributors are
+expected to follow. This code describes the *minimum* behavior expectations
+for all contributors.
+
+As a contributor to Node.js, how you choose to act and interact towards your
+fellow contributors, as well as to the community, will reflect back not only
+on yourself but on the project as a whole. The Code of Conduct is designed and
+intended, above all else, to help establish a culture within the project that
+allows anyone and everyone who wants to contribute to feel safe doing so.
+
+Should any individual act in any way that is considered in violation of the
+[Code of Conduct][], corrective actions will be taken. It is possible, however,
+for any individual to *act* in such a manner that is not in violation of the
+strict letter of the Code of Conduct guidelines while still going completely
+against the spirit of what that Code is intended to accomplish.
+
+Open, diverse, and inclusive communities live and die on the basis of trust.
+Contributors can disagree with one another so long as they trust that those
+disagreements are in good faith and everyone is working towards a common goal.
+
+## Bad actors
+
+All contributors to Node.js tacitly agree to abide by both the letter and
+spirit of the [Code of Conduct][]. Failure, or unwillingness, to do so will
+result in contributions being respectfully declined.
+
+A *bad actor* is someone who repeatedly violates the *spirit* of the Code of
+Conduct through consistent failure to self-regulate the way in which they
+interact with other contributors in the project. In doing so, bad actors
+alienate other contributors, discourage collaboration, and generally reflect
+poorly on the project as a whole.
+
+Being a bad actor may be intentional or unintentional. Typically, unintentional
+bad behavior can be easily corrected by being quick to apologize and correct
+course *even if you are not entirely convinced you need to*. Giving other
+contributors the benefit of the doubt and having a sincere willingness to admit
+that you *might* be wrong is critical for any successful open collaboration.
+
+Don't be a bad actor.
+
+* [Node.js Contributor Covenant Code of Conduct](https://github.com/nodejs/admin/blob/master/CODE_OF_CONDUCT.md)
 * [Node.js Moderation Policy](https://github.com/nodejs/admin/blob/master/Moderation-Policy.md)