* rstudio/master: (61 commits)
  make metadata available before running pre_knit (rstudio#1855)
  fix rstudio#1815: apply the lua filters pagebreak.lua and latex-div.lua to beamer_presentation
  require the data-latex attribute on fenced Div's again: rstudio#1779 (comment)
  start the next version
  CRAN release v2.3
  fold any code blocks with the class `foldable` for html_document output (rstudio#1835)
  fix rstudio#1828: add aria-hidden = "true" to empty <a> tags in highlighted code blocks generated by Pandoc to improve screen reader accessibility (rstudio#1833)
  add a news item for rstudio#1832
  roxygenize
  no need to turn on --file-scope or actually write the split content into files if the split content is of length < 2
  eliminate renumber_footnotes option
  only test two pandoc versions (devel and RStudio version) and upgrade default to 2.7.3 (rstudio#1846)
  close rstudio#1838: test more R versions on Travis (rstudio#1845)
  renumber_footnotes output format option
  add the <div class="kable-table"> only when the output format is HTML, otherwise the div will be converted to a LaTeX environment, leading to the bug https://stackoverflow.com/q/62340425/559676
  change name of file_scope argument to references_scope
  re-roxygenize
  Add `publish_site()` function for "one-button" publishing of R Markdown websites.
  Enable use of pandoc --file-scope for input files originating from multiple Rmds (rstudio#1837)
  Added missing lang attribute to ioslides_presentation template (rstudio#1841)
  ...