presdown: Build a directory of presentations

#' Build an online directory of slides in a way that's
#' friendly to you and continuous integration!
#' You use presdown to generate slides that haven't
#' been generated before or have out of date outputs,
#' incorporating dependencies listed in the DESCRIPTION
#' file and you can even grab the list based on a
#' directory of presentations.
#'
#' @name presdown
#' @docType package
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