Launches an example shiny app via
bs_theme_dependencies(). Useful for getting a quick preview of the current
theme setting as well as an interactive GUI for tweaking some of the main
bs_theme_preview(theme = bs_theme(), ..., with_themer = TRUE)
passed along to
whether or not to run the app with
nothing, this function is called for its side-effects (launching an application).
The app that this launches is subject to change.