There are plenty of offline documentation tools like Zeal (Linux, MacOS, Windows), Dash (MacOS) and dasht (for terminal and with VIM). Most of them support Dash format of offline docs. There are hundreds of pre-generated docsets (including Python) but Sage docset is missing.
There is a tool for generating python docset: doc2dash. It supports two doc formats: Sphinx and pydoctor. Unfortunately I'm not familiar with either of them neither with Sage docs.
So my question is: how to create SageMath docset with doc2dash?