Running locally can be done with Jekyll via bazel. Follow setup instructions at https://help.github.com/en/articles/setting-up-your-github-pages-site-locally-with-jekyll

You'll also need the jekyll-toc gem installed

To build and update the docs in the /docs folder, run

$ yarn stardoc

To serve the docsite locally, use

$ bazel run --noincompatible_strict_action_env //docs

The docsite is a mix of stardoc generated markdown and hand written markdown.
The files marked with

<!-- *********************
 DO NOT EDIT THIS FILE
  It is a generated build output from Stardoc.
  Instead you must edit the .bzl file where the rules are declared,
  or possibly a markdown file next to the .bzl file
 ********************* -->

Should be edited by modifying the docs in the source .bzl files. If updating css, then the scss in /docs/css should be edited. The HTML files in /docs are also generated and should not be edited directly, other files can be freely edited.