Provide highlight.js #3
Description
Both rmarkdown (https://github.com/rstudio/rmarkdown/tree/master/inst/rmd/h/highlightjs) and shiny (https://github.com/rstudio/shiny/tree/master/inst/www/shared/highlight) ship with versions of highlight.js in them.
It seems like one or both of these versions could be coming from htmldeps.
My use case in in covr, the reports are static documents, so don't really need a full shiny dependency, but I am currently using the highlight.js library from shiny, so it would be nice to have it in htmldeps instead.