Many years ago, I made an emacs script that plays back diffs between files as live edits in the emacs buffer: https://github.com/nma83/diff-actor

My nefarious intent was to make my screen at work look like I am editing code from remote login :). PS: the aciinema link for the demo video is dead right now.

The 'Click to expand' below each feature could be changed to 'Read more'.

mediawiki-mode in emacs seems like a good solution, and emacs has proven to be a good enough IDE for other programming languages.

Interesting, I didn't know about mediawiki-mode. Something like that does sound like the right way to go for a certain class of "power users" who want an IDE: build on top of an existing IDE, with interaction to Wikipedia itself done via the MediaWiki API.