feat: add Bundled Configuration for cross-document view transitions

[jaredcwhite]

Now that both WebKit (Safari) and Blink (Chrome, Vivaldi, etc.) support view transitions, I'd like to add support for adding this as a bundled configuration. It's actually easy to add via CSS naturally, but customizing the transition is a little non-obvious, so it'd be great to have an awesome default (just like our Turbo transitions previously).

This also would allow us to remove Turbo from the Bridgetown website itself which is currently used for nice transitions.