Document the new community contributions flow
What does this MR do and why?
This updates the documentation of community MRs workflow automations according to https://gitlab.com/gitlab-com/quality/contributor-success/-/issues/97 (implemented by gitlab-org/quality/triage-ops!1400 (merged)).
This should be linked to community contributors at some point.
This goes hand-in-hand with gitlab-com/www-gitlab-com!104914 (merged) (which updates the automated workflow description, mostly useful internally).
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.