This PR will also fix the markdown redirects.
There's no need to list markdown redirects, `.md` is automatically added
when building the redirects in `www` `next.config.mjs`.
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## Summary by CodeRabbit
- **Bug Fixes**
- Updated observability documentation redirects to use extension-free
URLs.
- Removed the outdated redirect from the observability access-data page.
- Updated the monitoring and debugging redirect to point to the
extension-free observability guide.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->