TiddlyWiki [0] is also a single HTML+JS page with incredible flexibility, and someone made kanban in it too: tekan [1].
There is a long list of task/project management adaptions, including more kanban implementations, here: https://dynalist.io/d/zUP-nIWu2FFoXH-oM7L7d9DM
[1] https://ibnishak.github.io/Tesseract/projects/tekan/Tekan.ht...