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.

• INSTALL.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: 227b9a1e-a8d1-4b01-a6f3-4c074fb98e1a

📥 Commits

Reviewing files that changed from the base of the PR and between 0f8c6e5 and 9f8ec3e.

📒 Files selected for processing (2)

• INSTALL.adoc
• SECURITY.adoc

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🔇 Additional comments (2)

INSTALL.adoc (1)

420-420: LGTM!

SECURITY.adoc (1)

413-413: LGTM!

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Updated the contributing guidelines links in the installation and security documentation to point to the correct location.

Walkthrough

The installation and security guides now point their contributing links to .github/CONTRIBUTING.md.

Changes

Contributing link paths

Layer / File(s)	Summary
Update documentation links INSTALL.adoc, SECURITY.adoc	Both contributing links now reference .github/CONTRIBUTING.md.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Suggested reviewers: metadatastician

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the documentation link updates caused by the relocated contributing guide.
Description check	✅ Passed	The description accurately explains the guide relocation and identifies both updated documentation links.
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 checked the guide with care
And found the right path waiting there
Two links now hop to one clear place
No maze remains to slow the pace
The docs sit neat, with gentle grace}

_{Comment @coderabbitai help to get the list of available commands.}

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud