Update Cloudflare docs related to Cloudflare Pages/Workers

[danawoodman]

Now that Cloudflare Workers supports all the features and more of Cloudflare Pages and Cloudflare itself is moving more in the direction of workers (perhaps soon rebranded to "Compute" based on their dashboard changes), I would like to suggest not recommending Pages as the default or at least mention there is now Beta support for pretty much all these features in Workers.

Page: https://svelte.dev/docs/kit/adapter-cloudflare-workers

Compatibility matrix: https://developers.cloudflare.com/workers/static-assets/compatibility-matrix/

Svelte framework docs for Workers: https://developers.cloudflare.com/workers/frameworks/framework-guides/svelte/

[eltigerchino]

Perhaps these documentation changes should be part of #13072 which adds the worker assets compatibility to the cloudflare workers adapter.