[Email Security] Migration docs

[Maddy-Cloudflare]

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PR Change Summary

Migrated documentation for Email Security, providing detailed instructions for users transitioning from Area 1 to Email Security.

• Added a comprehensive guide for migrating to Email Security
• Included step-by-step instructions for inviting users, creating webhooks, and setting up alerts
• Provided links to relevant resources and support for both Area 1 and Email Security
• Outlined processes for managing policies, reclassifications, and directory synchronization

Added Files

• src/content/docs/email-security/migrate-to-email-security.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/email-security/	@Maddy-Cloudflare, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://bf5ad64b.preview.developers.cloudflare.com
Preview Branch URL: https://maddy-email-security-pcx-17350.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/email-security/migrate-to-email-security/	https://maddy-email-security-pcx-17350.preview.developers.cloudflare.com/email-security/migrate-to-email-security/