Initial commit of DR scenario for Mesh

[justindavies]

Description

Scenario doc for Mesh DR and Failover scenarios

Preview Links

https://deploy-preview-3066--kongdeveloper.netlify.app/mesh/disaster-recovery/

Checklist

• Tested how-to docs. If not, note why here.
• All pages contain metadata.
• Any new docs link to existing docs.
• All autogenerated instructions render correctly (API, decK, Konnect, Kong Manager).
• Style guide (capitalized gateway entities, placeholder URLs) implemented correctly.
• Every page has a description entry in frontmatter.
• Add new pages to the product documentation index (if applicable).

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[slonka]

Didn't spot any errors but I think we're missing the "disaster" part of the guide. Would be great if we could simulate the failures and show graphs proving that the traffic was rerouted.