Do not change some types of URLs:
* URLs that do not have https support
* URLs in XML files, which might not work afterwards
* URLs in vendored files, which should get fixed upstream
Suggested-by: check-all-the-things
* README.org,
index.skr,
notes.org,
pages/best-practices.skr,
pages/projects.skr,
pages/projects/mes.md: Use https.