Runs a Shiny demo app or shows an overview of all Shiny demo apps related to topic.
If more than one app relates to topic a list of apps is shown otherwise the app is run.
demoApp()
demoApp('gettext')
Performs dollar substitution in a text.
dsub('$a EUR', a=3)
dsub('$a EUR', list(a=3))Creates lines for a README.md for Github based on roxygen2 comments using roxygen2::parse_package.