This adds a new Antora module for libpkl, and updates the language
bindings documentation.
Co-authored-by: Jen Basch <jbasch94@gmail.com>
Co-authored-by: Islon Scherer <islonscherer@gmail.com>
Motivation:
The standard library docs are some of the most important docs
but currently very hard to find. I've noticed that even advanced
users have never heard of them and complain about "zero docs".
Daniel Chao