[R2] Adding Sip n Slurp migration strategy

[Oxyjun]

Summary

Adding a migration strategy using Sippy first, then Super Slurper, to effectively migrate all objects into an R2 bucket without any downtime.

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Added a migration strategy for R2 using Sippy and Super Slurper to ensure seamless data migration without downtime.

• Introduced a new migration strategy section in the documentation.
• Outlined the use of Sippy for on-demand object copying.
• Described the use of Super Slurper for one-off migration of remaining objects.

Modified Files

• src/content/docs/r2/data-migration/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/r2/	@oxyjun, @elithrar, @jonesphillip, @aninibread, @harshil1712, @cloudflare/workers-docs, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://b1abced1.preview.developers.cloudflare.com
Preview Branch URL: https://jun-r2-sip-n-slurp.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/r2/data-migration/migration-strategies/	https://jun-r2-sip-n-slurp.preview.developers.cloudflare.com/r2/data-migration/migration-strategies/
https://developers.cloudflare.com/r2/data-migration/super-slurper/	https://jun-r2-sip-n-slurp.preview.developers.cloudflare.com/r2/data-migration/super-slurper/
https://developers.cloudflare.com/r2/data-migration/	https://jun-r2-sip-n-slurp.preview.developers.cloudflare.com/r2/data-migration/

[aninibread]

The content looks great! Let's have migration strategies as a separate page under "Data Migrations" to keep the Overview page a bit cleaner