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)

[Autsider666]

There's a badge for code of conduct, mentioned here by the way:
[![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-2.1-4baaaa.svg)](code_of_conduct.md)

[eonarheim]

@Autsider666 I agree, I think having these at the root is much better than in the .github folder. I'm soliciting some feedback from other maintainers but this seems like a solid idea

[Autsider666]

Just realized that I completely forgot to even create an issue to see if it was even needed. Sorry, will try to remember that next time :D

[Autsider666]

In case this gets merged: Redirect the new https://excaliburjs.com/contributing url (as seen here)

[eonarheim]

@Autsider666 Good call out, will do.

I'll need to update a few other repos/links that point at the old contributing location so I'm planning on doing this when I have a hour to rip through them all to point at the top level redirector https://excaliburjs.com/contributing

[github-actions]

This PR hasn't had any recent activity lately and is being marked as stale automatically.

[eonarheim]

We are planning on this move, just requires coordination in many repos

…

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