Add Cloudflare Astro 6 docs

[ascorbic]

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This PR updates the Cloudflare integration guide to use the new Astro 6 APIs. It also adds a migration guide for users moving from Astro 5 to 6. It includes some info about manually configuring Cloudflare Pages (which is no longer automatic), but it doesn't yet have a very good guide to migrate from Pages to Workers. It links out to the guide in the Cloudflare docs, but I'd like to add something more Astro-specific in a follow-up PR.

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[ArmandPhilippot]

Thank you Matt, this looks great! And well done with the upgrade guide! 🙌🏽

I left a few suggestions, most of them are nits and I expect you to weight on them as Cloudflare expert and native speaker to judge if this makes sense or not. 😅
The most important thing is your formatter which is messing with the API blocks... It would be better to revert these changes.

Otherwise, this looks to be in great shape to me!

[sarah11918]

@ascorbic I can see you have a bunch of comments from Armand and Alex, and I was going to wait until these were resolved to take a look here before looking into this one myself!

If you'd rather we just handle it from here, but ping you if there are things we're unsure of, then let me know and we'll work that way!

[florian-lefebvre]

@ascorbic do you need any help with this PR?

[sarah11918]

Thanks everyone for jumping in here! I've committed Yan's suggestions, and will give this a final read over before merging so that it's available to people ASAP!

[sarah11918]

Mostly syntax/light editing here, so I'm comfortable committing these! I've left comments for the ones that might need an explanation, or for future historical record/to demonstrate our choices.

If you catch something before I merge this, great! If not, we can update this page after the fact!