Update index.md

[azarboon]

Description

I've added a common challenge of using circuit breaker and a workaround so readers can take more informed decision.

Reviewers

• [ ] Ambient
• [x] Docs
• [ ] Installation
• [ ] Networking
• [ ] Performance and Scalability
• [ ] Extensions and Telemetry
• [ ] Security
• [ ] Test and Release
• [ ] User Experience
• [ ] Developer Infrastructure
• [ ] Localization/Translation