Unable to access the draft manual - React for python devs

I have been trying to build custom Dash components from React. I tried to take a shot at this months ago but couldn’t figure out how to include callbacks. I decided to come back to this again.

I have been referring to the (amazing!!) manual for React from https://github.com/plotly/dash-docs/pull/116. Its been very useful.

I am unable to access it anymore- any tips on how I can access it again? I know its still not ready, but any draft is helpful