improve client side navigation example

[hi-ogawa]

The demo code might be too simple and we probably want this logic at least https://github.com/hi-ogawa/reproductions/tree/main/vite-rsc-coordinate-history-and-transition and also back/forward cache, which should be a minimal requirement for simple doc site for example https://github.com/hi-ogawa/rscpress.

This should also take into account error handling #795