Build a "Hello, world" Shiny app (2)

Though this app doesn't actually do anything other than display the text "Hello, world!!!", you should get used to loading shiny and using the appropriate functions to create the UI, server, and actually run the app.

If the app were run in RStudio, it would look like:

For this exercise, make sure you create the UI before the server. You can do them in any order when building your own apps later, but for this course we'll write them in that order.