Add /notebooks/ to CODEOWNERS

[raonishanth2000-hub]

Summary

The top-level notebooks/ directory had no owner, so PRs touching any of its
8 files requested no reviewer. The per-audit entries' comment claimed to cover
"notebooks", but that only matches a notebooks folder inside an audit directory

• this repo keeps them all in one root-level folder.

Type

• Audit
• Explainer
• Bug fix
• Other

The change

+/notebooks/ @yakew7

Owner matches the audit directories these notebooks correspond to. Placed after
them - CODEOWNERS is last-match-wins, and no later pattern can match these paths.
Also drops notebooks from the per-audit comment, which described a layout this
repo does not use.

Verification

Ran tests/test_codeowners.py's own matcher over every path in git ls-files:

before:  35 unowned  (all 8 notebooks UNOWNED)
after:   27 unowned  (all 8 -> @yakew7)

$ python -m pytest tests/ -q
385 passed, 3 skipped

Note: the issue title says 8 files and the body lists 7 - 8 is correct. Two
names in the body don't exist, and 07_intersectional_bias_audit.ipynb is
missing from it.

---

Closes #581

[vercel]

Someone is attempting to deploy a commit to the yashkewlani2020-gmailcom's projects Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

Hey @raonishanth2000-hub, your first PR on Fair Code, that's awesome, thank you.

This project is about making AI more accountable, and contributions like yours are what keep that work going. We'll review your changes shortly.

If you haven't already, give the contributing guide a quick read: it covers how audits are structured and what we look for in a review.

And if you're finding Fair Code useful or interesting, a star on the repo genuinely helps more people find it - no pressure, just appreciated.

[github-actions]

@yakew7 @ahmdkaml - new PR touching a path you own, please review.