chore: remove nbykov from CODEOWNERS and CLAUDE.md (#491)

## Summary
- Remove @nbykov0 from `.github/CODEOWNERS`
- Remove the "Code Owners" section from `CLAUDE.md` (not needed as a
separate block)

## Test plan
- [x] Verify CODEOWNERS only lists @kvaps and @lllamnyp
- [x] Verify CLAUDE.md no longer has the Code Owners section

🤖 Generated with [Claude Code](https://claude.com/claude-code)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Chores**
  * Updated code ownership configuration to reflect current maintainers.
* **Documentation**
  * Removed code ownership section from project documentation.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: myasnikovdaniil

.github/CODEOWNERS

@@ -1 +1 @@
-* @kvaps @lllamnyp @nbykov0
+* @kvaps @lllamnyp

CLAUDE.md

@@ -106,7 +106,3 @@ Located in `layouts/shortcodes/`: `tabs`/`tab`, `note`, `warning`, `caution`, `i
 - Hugo frontmatter uses YAML
 - OSS health app pages use custom layout (`layouts/_default/oss-health-app.html`) with frontmatter keys: `oss_health_key`, `oss_health_kind`, `lede`, `source_url`
 - Goldmark rendering has `unsafe: true` enabled (raw HTML allowed in markdown)
-
-## Code Owners
-
-@kvaps, @lllamnyp, @nbykov0