Jadawin is a DSL for simple static website generation, together with a Ruby implementation. It is not a general purpose tool, for that consider Hugo or Jekyll or many others.
The documentation is online at documentation. It can be generated from the source files in the docs folder by running something like the following commands in a Bash shell:
gem install bundler ruby-vips liquid
BUNDLE_GEMFILE=ruby/Gemfile;export BUNDLE_GEMFILE
mkdir html
bundle exec ruby ruby/Compiler.rb docs config.yaml html
when positioned at the top-level of a clone of this repo. This will generate HTML files into a html folder.