CODE_OF_CONDUCT.md has out-of-date contact info

[beckettsean]

https://github.com/cosmos/relayer/blob/main/CODE_OF_CONDUCT.md references [email protected] as the contact point, which should be updated to something more relevant.

Most likely there is other bitrot in the documentation and it should be updated to be current.

[beckettsean]

Jessy from Amulet recommends v2.1 of this: https://www.contributor-covenant.org/version/2/1/code_of_conduct/

(The one currently live is v1.4 which is out of date)