Add examples for other scaffold_ functions

[JosiahParry]

The getting started doc does a lightweight example of scaffold_widget(). But the other scaffolds are very lightly touched.

I think it would be helpful to have a somewhat more "worked" example to help get started. I'm personally getting a bit lost in the ~~sauce~~ docs.

But perhaps this is because this package requires a fairly thorough knowledge of the JS ecosystem. After running the basic functions to create and scaffold the package I'm now trying to figure out where to go from here.