Use markdown files?

The files are written in HTML, currently.
If written in markdown, many tools can be utilised to enhance the learning:

https://foambubble.github.io/
https://markmap.js.org/
https://github.com/frenya/vscode-recall

https://github.com/lukesmurray/markdown-anki-decks
https://github.com/ashlinchak/mdanki

https://github.com/Yvee1/hascard
https://github.com/hikikones/Lazycard
