Improve navset documentation #595
Description
As pointed out by @vnijs on Discord, the navset documentation showcases all of the navset options at the expense of being hard to copy and paste during app development.
Would be great to have a simple example in the documentation of a navbar page with a sidebar layout. The current example in the documentation is a bit complex https://shiny.posit.co/py/api/ui.nav.html#shiny.ui.nav.
In bslib, I separated the examples into individual examples that are easier to copy and paste in rstudio/bslib#521