bookdown::gitbook: css: style.css config: toc: before: | <li><a href="./">R package development workshop</a></li> after: | <li><a href="https://github.com/rstudio/bookdown" target="blank">Published with bookdown</a></li> download: ["pdf", "epub"] bookdown::pdf_book: includes: in_header: preamble.tex latex_engine: xelatex citation_package: natbib keep_tex: yes bookdown::epub_book: default