Generate the human-readable pages of the validation rules
Source:R/utils_rules.R
generate_rules_pages.RdWrites one page per rules file to `<output_dir>/rules/<version>/index.html`, for example `docs/rules/2.0/index.html`. The pages are reachable by direct URL only: there is no `rules/index.html`, nothing links to them from the navigation, and they are neither in the sitemap nor indexed (`noindex`).