Assuming you have prepared to build the site, you just:
$ hhvm bin/build.php
This will:
- parse the API definitions in HHVM and Hack, storing machine-readable. data and documentation in YAML files.
- create canonical definitions, combining the data obtained from Hack and HHVM.
- generate CSS files from the SCSS source.
- generate Markdown files for the API documentation based on these YAML files.
- render all Markdown (API reference and written guides) to HTML.