This function defines a set of web dependencies necessary for using Bootstrap components in a web page.
bootstrapLib(theme = NULL)One of the following:
NULL (the default), which implies a "stock" build of Bootstrap 3.
A bslib::bs_theme() object. This can be used to replace a stock
build of Bootstrap 3 with a customized version of Bootstrap 3 or higher.
A character string pointing to an alternative Bootstrap stylesheet
(normally a css file within the www directory, e.g. www/bootstrap.css).
It isn't necessary to call this function if you use bootstrapPage() or
others which use bootstrapPage, such fluidPage(), navbarPage(),
fillPage(), etc, because they already include the Bootstrap web dependencies.