fix: point control-plane README link at current install guide

[axelmarciano]

The README "control plane mode" link pointed at a GitBook path that 404s (/controle-plane-mode/getting-started). That section no longer exists on current docs.

This points it at the current install guide: https://mercure-technologies.gitbook.io/xprem/installation-guide/overview

Stateless getting-started is unchanged.

Summary by CodeRabbit

• Documentation
  • Updated the Quick start control-plane documentation link to the current installation overview.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 48830cdf-db9f-4c55-b671-eebda2e902c3

📥 Commits

Reviewing files that changed from the base of the PR and between 9cb1ee1 and 525e056.

📒 Files selected for processing (1)

• README.md

Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review.

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📝 Walkthrough

Walkthrough

The README Quick start walkthrough now links to installation-guide/overview instead of the obsolete controle-plane-mode/getting-started path.

Changes

Documentation update

Layer / File(s)	Summary
Update Quick start documentation link README.md	The Quick start control-plane documentation link now points to installation-guide/overview.

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

Merge Risk: ⚪ Minimal · up to 525e0

This PR updates the control-plane README link to the current installation guide without changing product behavior; no actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the README link update to the current control-plane installation guide.
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 files. (1 skipped: 1 unsupported.)
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/readme-control-plane-docs-link

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