Pagedown: write a vignette on chrome_print and shiny

[cderv]

From https://github.com/rstudio/pagedown/pull/97#issuecomment-480575036, @colinfay offered to write a vignette on the feature chrome_print in a shiny app.

Are you still interested ?

[RLesur]

I feel such a vignette could be valuable. Here are some recent questions on this topic
https://github.com/rstudio/pagedown/issues/113#issuecomment-508789885
https://github.com/rstudio/pagedown/issues/91#issuecomment-558331313
and
https://community.rstudio.com/t/error-after-using-pagedown-to-generate-a-pdf-from-html-in-a-shinyapp/45999?u=rlesur

[RLesur]

If anyone (@cderv, @ColinFay, @r2evans, @smsenkier or anyone else) is interesting in contributing, PR are welcome! Thanks! I do not know enough about Shiny to write this vignette.

[ColinFay]

Can do, but I'm short on time in the upcoming weeks. When would you want it to be written?

[RLesur]

Thanks a lot! There is no due date (there's no deadline for volunteers 😄). I just feel that chrome_print() is increasingly being used with Shiny.