I do get the right navigation menu in this and any other layout using toc: true, but not the left navigation menu which is the most interesting feature of this theme. I tried to emulate the .md of the theme (https://github.com/gbif/jekyll-hp-base-theme/edit/master/pages/layout/documentation.md) and played around with several options such as permatlink: , sidebar:, and bringing external docs with the option {% include_relative xxxx.md %} but It did not work. For the available examples, I think that probably the left navigation menu needs to be configured externally.
How can I make proper use of the documentation layout? How can I configure the left navigation menu?