delphidocs on dev

[dajmcdon]

Checklist

Please:

• Make sure this PR is against "dev", not "main" (unless this is a release
  PR).
• Request a review from one of the current main reviewers:
  brookslogan, nmdefries.

Change explanations for reviewer

[brookslogan]

Looks good as far as I can tell. Let's see if GitHub Actions agrees...

[brookslogan]

Changes probably won't be immediate for the main (non-dev) site. Might need to manually use workflow dispatch to re-build main site if we don't release soon. [Nevermind, we would need to update some of the files as well. 566 is set to do this directly on main.]

[brookslogan]

Hmm, dev site required a force-refresh on firefox to render correctly, but seems to look good now.