README.md: release steps are out of date

[SgtPooki]

Describe the bug

aegir/README.md

Lines 137 to 151 in 56f2681

	## Release steps
	1. Run linting
	2. Run type check
	3. Run tests
	4. Bump the version in `package.json`
	5. Build everything
	6. Update contributors based on the git history
	7. Generate a changelog based on the git log
	8. Commit the version change & `CHANGELOG.md`
	9. Create a git tag
	10. Run `git push` to `origin/master`
	11. Publish a release to Github releases
	12. Generate documentation and push to Github Pages
	13. Publish to npm

is out of date and we should

describe how to get set up with js unified CI

see #994 (comment)