Improve static export documentation (#47251)
There has been some helpful [discussion on Twitter](https://twitter.com/dan_abramov/status/1636778278882099216) around this page of documentation. I refactored the introduction to make it more clear that you also get to use SPA features when doing a static export, and underscoring the value of being able to deploy/host virtually anywhere with this approach.
Co-authored-by: Steven <229881+styfle@users.noreply.github.com>
