fix: fern docs url

[ebalduf]

This fix will allow preview all of the combined documents.

Fern uses a set of URLs to preview documents. Our tooling picks URLs for this, but picked a unique one for each repo (the Service and the Agent) but we need these to be the same across all combined repos to make it all work together.

Summary by CodeRabbit

• Documentation
  • Updated the documentation site URL to the new fleet-intel domain.

[coderabbitai]

📝 Walkthrough

Walkthrough

The Fern documentation instance URL now uses the fleet-intel domain.

Changes

Documentation URL

Layer / File(s)	Summary
Update Fern documentation URL fern/docs.yml	The instance URL changed to fleet-intel.docs.buildwithfern.com.

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

Possibly related PRs

• NVIDIA/fleet-intelligence-agent#238: Added the Fern documentation scaffolding and configuration.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the Fern documentation URL fix, which is the main change in the pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-fern-url

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