Experimental client prerendering

Continue to use the `data-astro-prefetch` attribute on any `<a />` link on your site to opt in to prefetching.
Instead of appending a `<link>` tag to the head of the document or fetching the page with JavaScript, a `<script>` tag will be appended with the corresponding speculation rules.

Client side prerendering requires browser support. If the Speculation Rules API is not supported, `prefetch` will fallback to the supported strategy.

See the [Prefetch Guide](/en/guides/prefetch/) for more `prefetch` options and usage.