[BUG] `CODE_OF_CONDUCT.md` is outdated and should just link to the new Code of Conduct

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Bug description

CODE_OF_CONDUCT.md is no longer updated, and has been replaced by the new wiki pages.

Possible fixes or solutions

Replace all the content of CODE_OF_CONDUCT.md with a link to the Code of Conduct wiki page.

Additional information

Related to #1329
Diff between CODE_OF_CONDUCT.md(left) and Code of Conduct(right) -> https://www.diffchecker.com/lnmZVP6x