docs: 3.0 release notes

[bennypowers]

What I did

1. Drafted release notes for pfe-3

https://deploy-preview-2735--patternfly-elements.netlify.app/blog/pfe-3-release/

[changeset-bot[bot]]

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Latest commit: 58a5670ec251b136ed000834db7f54087c8f6e00

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[github-actions[bot]]

"\n## 👕 Commitlint Problems for this PR: \n\n🔎 found 4 errors, 0 warnings\nℹ️ Get help: https://github.com/conventional-changelog/commitlint/#what-is-commitlint\n \n\n\na35a69b6 - Updated contributor names \n\n\n- ❌ subject may not be empty\n- ❌ type may not be empty \n\n\n99a251a3 - Minor punctuation cleanup \n\n\n- ❌ subject may not be empty\n- ❌ type may not be empty "