fix(docs): repoint references to the relocated contributing guide

[hyperpolymath]

fix(docs): repoint references to the relocated contributing guide

The guide moved to .github/CONTRIBUTING.md; these references still resolved
against the old root location and 404 from where they are written. Rewritten
using the correct relative depth.

• README.adoc: CONTRIBUTING.md -> .github/CONTRIBUTING.md
• SECURITY.adoc: CONTRIBUTING.md -> .github/CONTRIBUTING.md

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: d7fb6747-45b4-4c2d-ba61-4ad17aad296f

📥 Commits

Reviewing files that changed from the base of the PR and between 13a8f39 and 11ece53.

📒 Files selected for processing (2)

• README.adoc
• SECURITY.adoc

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

📜 Recent review details

⏰ Context from checks skipped due to timeout. (4)

• GitHub Check: secret-scan / rust-secrets
• GitHub Check: secret-scan / gitleaks
• GitHub Check: secret-scan / shell-secrets
• GitHub Check: CodeQL Analysis (actions, none)

🔇 Additional comments (2)

README.adoc (1)

320-320: LGTM!

SECURITY.adoc (1)

425-425: LGTM!

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Updated contributing-guidelines links in the README and security policy to point to the correct location.

Walkthrough

The README and security policy now link to .github/CONTRIBUTING.md instead of CONTRIBUTING.md.

Changes

Documentation link updates

Layer / File(s)	Summary
Contributing link targets README.adoc, SECURITY.adoc	The contributing links now target .github/CONTRIBUTING.md.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Other

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly states that documentation references to the relocated contributing guide were corrected.
Description check	✅ Passed	The description accurately explains the path correction in README.adoc and SECURITY.adoc.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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_{A rabbit checks the guiding trail
The right path now will never fail
README points the way
Security joins today
To .github, neat and clear}

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