docs: Document versions in README.md#130

limakzi wants to merge 3 commits intomaingap-system/docker:mainfrom

129-the-readmemd-file-should-contain-some-details-of-what-is-installed-in-each-of-the-bare-slim-and-fullgap-system/docker:129-the-readmemd-file-should-contain-some-details-of-what-is-installed-in-each-of-the-bare-slim-and-fullCopy head branch name to clipboard