mdbook Nixago Presets

{
  book = {
    language = "en";
    multilingual = false;
    src = "docs";
    title = "Documentation";
  };
  build = {
    build-dir = "docs/book";
  };
  preprocessor = {
    kroki-preprocessor = {
      command = "mdbook-kroki-preprocessor";
    };
  };
}

If you have a good idea how to make these presets more useful, please consider to submit a PR.