docs: clarify migration guide for v0.10.3+

[onmax]

In some discord channels, and also a coworker of mine, have shown some frustation when migrating to NuxtHub.

My coworker specifically said:

The migration of Nuxthub to Cloudflare is weird.
The migration "wizard" of NuxtHub admin says to change the Nitro preset to cloudflare_modulebut that is not mentionend anywhere else in the migration docs. The wrangler config is also different across docs and wizard. How can one even be sure to have the right settings?
And why would we even still need the nuxthub Nuxt module?
And then the docs for installing v10 say one doesn't neven need a wranger.jsonc. https://hub.nuxt.com/docs/getting-started/deploy wtf

I think there is room for improvment and the guide can be clearer

Summary

Clarifies the migration guide to address confusion around wrangler configuration and version scope.

Key improvements:

• Explicitly states this is v0.9 → v0.10 migration (not v0.5)
• Highlights v0.10.3+ auto-generates wrangler.json from nuxt.config.ts
• Restructures Cloudflare section into two clear options:
  • Option A (Recommended): Config in nuxt.config.ts → auto-generated wrangler.json
  • Option B: Manual wrangler.jsonc
• Updates migration checklist with provider-specific steps
• Warns migration wizard may show outdated v0.5 instructions

Resolves confusion:

• "Migration wizard says use cloudflare_module preset" → Now clarified as outdated v0.5 info
• "Wrangler config different across docs" → Now consistent with deploy.md
• "Docs say no wrangler.jsonc needed" → Now explicit that it's optional since v0.10.3

[vercel]

@onmax is attempting to deploy a commit to the NuxtLabs Team on Vercel.

A member of the Team first needs to authorize it.

[pkg-pr-new]

npm i https://pkg.pr.new/@nuxthub/core@770

commit: 3b90116

[atinux]

Thank you!