docs: add cpp-linter hub badge to README

[shenxianpeng]

Summary

Adds the 🏠 cpp-linter hub ← home badge for consistent cross-repo navigation back to cpp-linter.github.io.

Part of org-wide Phase 2 documentation consistency improvements.

Changes

• Added hub badge to the badge row in README.md

Summary by CodeRabbit

• Documentation
  • Added a new "cpp-linter hub" badge to the project documentation.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 859089ec-1ee2-4397-bae1-7e0599d9db2a

📥 Commits

Reviewing files that changed from the base of the PR and between 4400eab and 3ec2fca.

📒 Files selected for processing (1)

• README.md

Walkthrough

This PR adds a "cpp-linter hub" badge to the README badges section. The change includes the badge markdown link and its associated image source and destination URL reference definitions, introducing a single new reference to the project documentation.

Changes

README Badge Addition

Layer / File(s)	Summary
cpp-linter hub badge README.md	Added "cpp-linter hub" badge to the badges list with corresponding image and link reference definitions.

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 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 accurately describes the main change: adding a cpp-linter hub badge to the README file, which aligns perfectly with the pull request objectives.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-hub-badge

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