This requires pulling quite a lot of code from nixpkgs in order to
make the `either` type work correctly, the effects can be seen for
example in the documentation of `ollama.promps` and `ollama.actions`
* docs: mdbook init
* Separate sub-options into their section
* docs: enable fold
* docs: merge core options into a single section
* doc generation: fix submodules index pages
* docs: add contributing section
* docs: rename 'core' group to 'Neovim Options'
docs: removed the index pages of empty sections
docs: remove obsolete 'mergeFunctionResults' function
* docs: use nix syntax highlighting
* docs: point to the new repo url
* docs: use recursive generation
docs: split submodules into subsections
* docs: fix contributing separator
docs: fix missing submodules docs
