## What kind of change does this PR introduce?
docs update
## What is the new behavior?
Moving the new `error-codes` page to "Debugging" section.
Adding link reference to it under `status-codes` page.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
## Release Notes
* **Documentation**
* Reorganized Error Codes guide navigation to the Debugging section for
improved discoverability
* Enhanced status codes guide with details on HTTP status codes and
error response headers in Edge Functions
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