WEB: Add greeting note to CoC
I noticed something similar in the [CPython contributing docs](https://cpython-core-tutorial.readthedocs.io/en/latest/diversity.html):

> For example, don’t say “hey guys!” but “hey everyone!”.

and thought it was really nice.

Pushing directly rather than opening as good first issue to avoid invoking a s*******m
Should be good - can you merge master to get green? I agree this feels a bit "out of place" where it is added now If you can merge master, looks like something (I guess unrelated) failed. Thanks @MarcoGorelli 