I don't know whether it has what you are looking for but there is :
https://wowpedia.fandom.com/wiki/Wow..._customization
Which is the main page for the UI side of WOW
https://github.com/Gethe/wow-ui-source/tree/classic
Which is the source code for the Classic versions of wow
https://github.com/Gethe/wow-ui-source/tree/live
Which is the retail version equivalent