[📑 Docs]: Expand page: Chaos Serverless Multi-Region Failover

What docs changes are you proposing?

Source: https://github.com/localstack-samples/sample-chaos-serverless-multi-region-failover

Problem

Currently this sample app is only linked as a GitHub repo. Users must leave the docs to understand it.

Proposal

• Create a dedicated doc page with:
  • Introduction (purpose: simulate regional outages + failover)
  • Prerequisites (LocalStack Pro, Docker, SAM/CDK runtime, Node.js)
  • Architecture diagram (Region A + Region B, API Gateway/Lambda + Route 53 failover)
  • Steps (clone repo, deploy stacks, simulate outage)
  • Testing the application (invoke API in failover, verify Route 53 health checks)
  • Conclusion (resiliency testing patterns)

Acceptance Criteria

• Page matches tutorial format with diagram and explicit Testing the application section.

Code of Conduct

• I agree to follow this project's Code of Conduct