feat: add `turbo` setting to enable navigation without full-page reloads

ElMassimo commented 2 years ago

Description 📖

This pull request adds a new turbo setting which enables SPA-like navigation for îles pages.

It combines techniques from quicklink and @hotwired/turbo, but taking advantage of the architecture of an îles site to achieve it in under 2kb.

Links in the viewport are detected and prefetched like in quicklink
When a link is clicked, the head and body are replaced using the prefetched html, like in @hotwired/turbo
Any islands in the previous page are automatically disposed, islands in the new page are hydrated as needed

Future Work 🔮

It's possible to avoid unmounting islands that don't change from one page navigation to the other, making them automatically "permanent" (in the @hotwired/turbo terminology) without any intervention from the user.

That would allow persistent components typically found in SPAs like shopping carts to work seamlessly.