bookdown::gitbook:
  css: style.css
  split_by: "chapter"
  citation_package: natbib
  config:
    toc:
      before: |
        <li><a href="./">Supplemental material</a></li>
      after: |
        <li><a href="https://github.com/rstudio/bookdown" target="blank">Published with ❤ and bookdown</a></li>
    edit: https://github.com/amlalejini/directed-digital-evolution/tree/main/%s
#     download: ["pdf"]
# bookdown::pdf_book:
#   latex_engine: pdflatex
#   citation_package: natbib
#   keep_tex: yes
#   split_by: "chapter"