[Pages] Clarify vercel migration guide

[kodster28]

Summary

Clarification on Vercel migration guide + removal of confusing last step

[hyperlint-ai]

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PR Change Summary

Clarified the Vercel migration guide and removed a confusing last step.

• Updated the tutorial for migrating from Vercel to Cloudflare Pages with clearer instructions.
• Removed the last step regarding deleting the Vercel application after migration to reduce confusion.
• Added a new section for setting up custom domains with a detailed step-by-step guide.

Modified Files

• src/content/docs/pages/configuration/custom-domains.mdx
• src/content/docs/pages/migrations/migrating-from-vercel/index.mdx

Added Files

• src/content/partials/pages/custom-domain-steps.mdx

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[github-actions]

Preview URL: https://75d27114.preview.developers.cloudflare.com
Preview Branch URL: https://vercel-migration-tweak.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/pages/migrations/migrating-from-vercel/	https://vercel-migration-tweak.preview.developers.cloudflare.com/pages/migrations/migrating-from-vercel/
https://developers.cloudflare.com/pages/configuration/custom-domains/	https://vercel-migration-tweak.preview.developers.cloudflare.com/pages/configuration/custom-domains/