feat: Move CONTRIBUTING.md and CODE_OF_CONDUCT.md to repository root

[Autsider666]

I've had this idea for quite a while now, but never acted on it until a potential contributor asked how to contribute on discord. I'm a big fan of best practices, so I'm glad that there's even one for the position of CONTRIBUTING.md and CODE_OF_CONDUCT.md

• [ ] Set PR to squash all the commits if it's not already so (You can only change 1 file per commit in the browser)