learnr packages are for creating R tutorials with shiny apps running under the hood. Normally, running them require you to run a server or purchase shiny apps hosting service.
However, Binder service can provide an alternative. Following are two examples of learnr
tutorials running on Binder.
The Binder image has Jupyter notebook with R and RStudio installed. Rstudio can be invoked to develop and troubleshoot tutorials. Following Binder links will show you how to get to these endpoints