Dawnpm iyaii collab may release notes

[dawnpm]

PR Checklist

• [x] Test Cloud.gov Pages preview for your branch for functionality - make sure all links and buttons work, javascript works as intended, and updates display as expected
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• [x] Conduct a HemingwayApp review of the content for plain language. Request plain language review in #helpwanted if needed before merging this PR
• [x] Conduct a Lighthouse Audit via Chrome Developer Tools. Identify any issues that must be addressed before merging, and fix
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[dawnpm]

@MyNameIsMissing and @jimkreft Iya and I worked on posting the May release notes. Please review. @jimkreft please go ahead and merge after your review, unless there are changes. Thanks!