[AngusH]

I once wrote a software release checklist system with custom values in php which worked quite well, if you have a server to run it on.

But I'm not sure thats the best bet for new work today.

It might be worth looking at interactive fiction tools like https://twinery.org or https://www.inklestudios.com/ink/

They sort of do everything you need already including variable ui+storage, javascript processing, html output and save/reload.

Twine also supports complete backtracking if you use the sugarcube dialect.