Document & automate release process

[ralfhandl]

Steps

1. Update EDITORS.md on main
2. Merge main into dev and dev into vX.Y-dev via PRs
   • Sync PRs are automatically created
3. Prepare spec files in vX.Y-dev
   • npm run format-markdown
   • npm run build-src
   • open deploy-preview/oas.html in browser and verify correct formatting
   • adjust and repeat until done
   • merge changes to src/oas.md back into vX.Y-dev via PR
4. Create vX.Y.Z-rel from vX.Y-dev and adjust it
   • move src/oas.md to versions/X.Y.Z.md
   • copy EDITORS.md to versions/X.Y.Z-editors.md
   • delete src/schemas
   • delete tests/schema
   • create script or workflow to automate these steps?
5. merge vX.Y.Z-rel into main via PR
6. publish main to gh-pages (existing automation)