Wikis don't support hiding dark/light art

[jsoref]

Following on #12233, there's apparently a way to hide dark / light images in GitHub

It was announced via twitter -- https://twitter.com/ashtom/status/1463554157932023808 says:

Works for Markdown files in repos, gists, and your profile/org READMEs.

That doesn't appear to include Wikis.

Consider the following markdown:

Hello ![copy-dark]![copy-light] World

[copy-dark]: https://user-images.githubusercontent.com/11576465/156061427-10f83808-602f-4674-86cc-bbd9eae6e597.svg#gh-dark-mode-only
[copy-light]: https://user-images.githubusercontent.com/11576465/156061498-0a30cc05-fec2-46e0-8e31-1ae7ba8fdd7f.svg#gh-light-mode-only

---

Hello World

---

Here's how it renders in this GitHub Discussion post:

Here's how it renders in a wiki:

Expected results

I should be able to use the same features in the Wiki as I can in the rest of GitHub, or at least this specific piece of black magic.