Provide stronger distinction between Community Guidelines & Code of Conduct

[mgifford]

I haven't looked into this in too much detail, but just looking at Community Guidelines & Code of Conduct - they seem pretty similar.

I can see more of a distinction here:
https://github.com/open-policy-agent/opa/blob/main/COMMUNITY_GUIDELINES.md

If the code of conduct is a generic one say like:
https://www.contributor-covenant.org/version/2/0/code_of_conduct/

Then you might want to include other pieces for other kinds of communities.

But I do think it would be useful to know at what stage of a project this is useful. I do really think that some projects are small enough that this isn't relevant, even if it is a mature project.