[Registrar] Updated overview page links

[dcpena]

Added new link to overview page and reordered CTAs. Updated page title in the nav for clarity. Addresses PCX-15240.

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PR Change Summary

Updated the overview page links and improved navigation clarity.

• Added a new link to the overview page
• Reordered call-to-action buttons
• Updated page title for better clarity

Modified Files

• src/content/docs/registrar/account-options/index.mdx
• src/content/docs/registrar/index.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/registrar/	@dcpena, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://27924f1f.preview.developers.cloudflare.com
Preview Branch URL: https://dpena-registrar.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/registrar/	https://dpena-registrar.preview.developers.cloudflare.com/registrar/
https://developers.cloudflare.com/registrar/account-options/	https://dpena-registrar.preview.developers.cloudflare.com/registrar/account-options/