Adding Shiny Core Syntax Choice to the Docs

[pevolution-ahmed]

When I'm reading the docs now it seems that it's focusing on showcasing shiny for novice in express but what about people that are early adaptors of shiny and know best the shiny core? examples in https://shiny.posit.co/py/docs/ui-dynamic.html & https://shiny.posit.co/py/docs/user-interfaces.html are in express only now and that could be confusing for some people (including me) I think.

I'd recommend the same tabs structure that exists in https://shiny.posit.co/py/docs/ui-overview.html to provide the choice either to show shiny.core syntax or shiny.express syntax in every piece, that would be more transparent and flexible than just providing the shiny express version only.