gitbook: The GitBook output format
In sawyerda/bookdown: Authoring Books and Technical Documents with R Markdown

This output format function ported a style provided by GitBook (https://www.gitbook.com) for R Markdown.

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gitbook(fig_caption = TRUE, number_sections = TRUE, self_contained = FALSE, 
    lib_dir = "libs", ..., split_by = c("chapter", "chapter+number", "section", 
        "section+number", "rmd", "none"), split_bib = TRUE, config = list())

`fig_caption, number_sections, self_contained, lib_dir, ...`	Arguments to be passed to `rmarkdown::html_document()` (`...` not including `toc`, `theme`, and `template`).
`split_by`	How to name the HTML output files from the book: `rmd` uses the base filenames of the input Rmd files to create the HTML filenames, e.g. generate ‘chapter1.html’ for ‘chapter1.Rmd’; `none` means do not split the HTML file (the book will be a single HTML file); `chapter` means split the file by the first-level headers; `section` means the second-level headers. For `chapter` and `section`, the HTML filenames will be determined by the header ID's, e.g. the filename for the first chapter with a chapter title `# Introduction` will be ‘introduction.html’; for `chapter+number` and `section+number`, the chapter/section numbers will be prepended to the HTML filenames, e.g. ‘1-introduction.html’ and ‘2-1-literature.html’.
`split_bib`	Whether to split the bibliography onto separate pages where the citations are actually used.
`config`	A list of configuration options for the gitbook style, such as the font/theme settings.