How GitHub uses GitHub to document GitHub

This post details the migration of the GitHub Help site from a custom-built Rails application to a static Jekyll site hosted on GitHub Pages. Key technical aspects include: replacing a Rails app with Jekyll for serving documentation, using Jekyll's Collections and data files for content references (conrefs), implementing versioned documentation using Liquid tags and audience flags in `_config.yml`, switching from Elasticsearch to lunr-js for client-side search, and leveraging `html-proofer` and Capybara for testing. The migration aimed to improve performance, reduce operational overhead, and simplify the documentation workflow.