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* actions: update "understanding github actions" Take a refresh pass on the "understanding github actions" document, in order to reinforce our CI/CD messaging and definitions, and update the art with high-res illustrations. * Apply suggestions from code review Co-authored-by: Martin Lopes <martin389@github.com> Co-authored-by: Martin Lopes <martin389@github.com> Co-authored-by: jmarlena <6732600+jmarlena@users.noreply.github.com>