[Fundamentals] Added account & domain best practices

[dcpena]

Addresses PCX-8931.

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PR Change Summary

Enhanced account and domain management documentation with best practices for users.

• Added a new section on account and domain management best practices.
• Included references to best practices in existing account and domain management pages.
• Created a dedicated document outlining strategies to maintain access to accounts and domains.

Modified Files

• src/content/docs/fundamentals/account/create-account.mdx
• src/content/docs/fundamentals/manage-domains/index.mdx

Added Files

• src/content/docs/fundamentals/reference/best-practices.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/fundamentals/	@dcpena, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://120d5c3c.preview.developers.cloudflare.com
Preview Branch URL: https://dpena-best-practices.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/fundamentals/reference/best-practices/	https://dpena-best-practices.preview.developers.cloudflare.com/fundamentals/reference/best-practices/
https://developers.cloudflare.com/fundamentals/account/create-account/	https://dpena-best-practices.preview.developers.cloudflare.com/fundamentals/account/create-account/
https://developers.cloudflare.com/fundamentals/manage-domains/	https://dpena-best-practices.preview.developers.cloudflare.com/fundamentals/manage-domains/