add_webex_to_bookdown() now does this if bookdown_dir doesn't have an index.Rmd file.
To check:
it takes 4 bookdown formats; are these all the bookdown HTML formats?
are the default _output.yml parameters I set sensible?
should we change the name of this function, since we'll change the name of webex?
Should the function add a webex_demo.Rmd to any bookdown? And then change index.Rmd (if missing) to a file that explains how to set up a bookdown (links to bookdown site, render function, etc)?
Would be great to have a function
webex::bookdown_template(dir="targetdir")
that creates a starter bookdown book with webex functionality; something like the psyteachr book template but more minimal.