fix(cloudflare-pages): write _headers and _redirects

[pi0]

🔗 Linked issue

(context: reported in solid discord channel)

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This PR enables writing _headers and _redirects file for cloudflare pages (non static). This resolves respecting header rules but also allows leveraging more CDN native primitives.

Example _headers:

/rules/headers
  cache-control: s-maxage=60
/rules/cors
  access-control-allow-origin: *
  access-control-allow-methods: GET
  access-control-allow-headers: *
  access-control-max-age: 0
/rules/nested/*
  x-test: test
/build/*
  cache-control: public, max-age=3600, immutable

Example _redirects

/rules/nested/override	/other	307
/rules/redirect/wildcard/*	https://nitro.unjs.io/**	307
/rules/redirect/obj	https://nitro.unjs.io/	308
/rules/nested/*	/base	307
/rules/redirect	/base	307

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.