Problem: we have two CODE_OF_CONDUCT files.
1. In CPython: https://github.com/python/cpython/blob/main/CODE_OF_CONDUCT.md (last updated 3 years ago)
2. In Python org, default for all repos: https://github.com/python/.github/blob/master/CODE_OF_CONDUCT.md

But, since CODE_OF_CONDUCT is an important document, I want to raise a discussion first. Should it be deleted from CPython repo?

Pros: GitHub offers org-default and CODE_OF_CONDUCT will still be rendered in several places:
- https://user-images.githubusercontent.com/4660275/147888475-f1bc5e79-078b-4ec7-9484-53b90373c3c9.png
- https://user-images.githubusercontent.com/4660275/147888477-35c98df8-2730-4d9b-a568-76b6b46da015.png

It will be also easier to edit a single-source-of-truth. For example, this commit was not back-ported to CPython: https://github.com/python/.github/commit/237d2151f18380c8146557febfe5858fe3f23232 

Also, other repos like mypy / typeshed / typing use org-default CoC.

Cons: some people might still miss that CPython has a CoC. 

This is a follow-up to: https://github.com/python/cpython/pull/30294

If others agree, I can send a PR to remove CPython's local copy of CoC.