Clean up the pages
Many of the pages are out of date and/or no longer valid.
Suggestion: move these to an archive
directory in the repo and ensure that directory isn't included in the build. That way if people want to see them they'll still be visible in a rendered form in the Gitlab UI, but they won't be a part of the official site.
A list of candidate pages for archiving:
Edited by VM Brasseur