[Fundamentals] Revised adding a site to CF

[dcpena]

Revised the Add a site page to focus on adding an existing domain to Cloudflare instead of completely duplicating the full setup docs. PCX-15743.

[github-actions]

This PR changes current filenames or deletes current files. Make sure you have redirects set up to cover the following paths:

• /fundamentals/setup/manage-domains/connect-your-domain/

[hyperlint-ai]

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PR Change Summary

Revised the Add a site documentation to focus on connecting an existing domain to Cloudflare, streamlining the onboarding process.

• Updated instructions to emphasize connecting existing domains instead of full setup duplication.
• Clarified the role of Cloudflare as a reverse proxy and DNS provider.
• Modified prerequisites and steps for adding a site to improve clarity and accuracy.

Modified Files

• src/content/docs/fundamentals/setup/manage-domains/add-site.mdx
• src/content/partials/fundamentals/add-site.mdx
• src/content/partials/fundamentals/update-nameservers.mdx

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[github-actions]

Preview URL: https://71026d76.preview.developers.cloudflare.com
Preview Branch URL: https://dpena-fundamentals-dns-setup.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/fundamentals/setup/manage-domains/connect-your-domain/	https://dpena-fundamentals-dns-setup.preview.developers.cloudflare.com/fundamentals/setup/manage-domains/connect-your-domain/
https://developers.cloudflare.com/fundamentals/setup/manage-domains/add-site/	https://dpena-fundamentals-dns-setup.preview.developers.cloudflare.com/fundamentals/setup/manage-domains/add-site/
https://developers.cloudflare.com/dns/zone-setups/reference/domain-status/	https://dpena-fundamentals-dns-setup.preview.developers.cloudflare.com/dns/zone-setups/reference/domain-status/
https://developers.cloudflare.com/dns/concepts/	https://dpena-fundamentals-dns-setup.preview.developers.cloudflare.com/dns/concepts/
https://developers.cloudflare.com/dns/proxy-status/	https://dpena-fundamentals-dns-setup.preview.developers.cloudflare.com/dns/proxy-status/