Move the mdbook menu rendering code into the module system and
generalise it to apply to multiple "categories" (mdbook parts) and
"types" of category (prefix, suffix, etc).
Based of the README for now, with a small additional "welcome to the
docs" section.
Perhaps in future, we could re-use the README.md verbatim? Perhaps with
some additional post-processing.
I think we'd want to dramatically reduce its size first though.
By having a dedicated homepage outside of `user-guide`, this fixes#1625
This commit only adds Home-Manager specific options, we should add
sections for the different kind of modules too.
This is _not_ added to the man docs, as it is more complex. If need
arises we could look into how to do it.
This adds the `nixvimExtend` attribute to the generated standalone
derivation, this attribute takes a module as an argument and returns a
new standalone derivation with the initial module & the extended module
merged together.
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`
