`CONTRIBUTING.md` refers to non-public Working Agreement

[Fayti1703]

Problem

The working agreement linked here:

.github/CONTRIBUTING.md

Line 29 in 569cfe8

More details on our values and other agreements in the [working agreements document](https://github.com/comcode-org/people_and_process/blob/main/conduct/working_agreements.md).

is not publicly accessible.

This prevents any non-volunteer who is interested in more details from reading about them.

Context