[Fundamentals] Added task for single accounts

[dcpena]

Added a subtask for copying an account ID when you only have one account. closes #21962

[hyperlint-ai]

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PR Change Summary

Added a subtask for copying an account ID for users with a single account in the Cloudflare dashboard.

• Introduced instructions for copying the account ID for users with a single account.
• Updated the documentation to enhance user guidance for account management.

Modified Files

• src/content/docs/fundamentals/setup/find-account-and-zone-ids.mdx

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[github-actions]

Preview URL: https://b59a2390.preview.developers.cloudflare.com
Preview Branch URL: https://dpena-find-account-id.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/fundamentals/setup/find-account-and-zone-ids/	https://dpena-find-account-id.preview.developers.cloudflare.com/fundamentals/setup/find-account-and-zone-ids/