Plot output in image is not described in any example code

[schloerke]

https://github.com/DivadNojnarg/outstanding-shiny-ui/blob/ba9293faeb17d142bd5d83dfe0cc72e62c64ad88/going-further-reactR.Rmd#L1103

This looks like an updated geyser app. But no plot is listening to the UI in the chapter.