Please see here for automatically regenerated docs from this Autocrypt specification repository:
https://autocrypt.org/
If you want to read and work on the docs locally checkout the doc directory which contains a sphinx documentation project.
You can install sphinx and then run
make html in the doc directory to regenerate docs locally.
For implementation development repos, see https://autocrypt.org/dev-status.html
Copyright 2016-2019, the Autocrypt team, CC0 license.