docs: add back-navigation link to cpp-linter hub

[shenxianpeng]

Adds ← Back to cpp-linter hub navigation link in both:\n- The MkDocs site nav\n- The README.md\n\nThis makes it easy for users to navigate back to the central hub from the cpp-linter-action documentation.

Summary by CodeRabbit

• Documentation
  • Added a "cpp-linter hub" badge/link to the project README header.
  • Updated site navigation to include a link to the cpp-linter hub, making the external hub more discoverable from the documentation site.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 4be98c6c-f157-414c-8668-4b84d10d7441

📥 Commits

Reviewing files that changed from the base of the PR and between d5dff2b and d57783f.

📒 Files selected for processing (1)

• mkdocs.yml

✅ Files skipped from review due to trivial changes (1)

• mkdocs.yml

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Walkthrough

Adds a cpp-linter hub badge to the README header and a navigation entry in mkdocs.yml; both link to https://cpp-linter.github.io/.

Changes

Documentation and navigation links to cpp-linter hub

Layer / File(s)	Summary
README badge and MkDocs nav entry README.md, mkdocs.yml	Inserted a GitHub-style “cpp-linter hub” badge linking to https://cpp-linter.github.io/ in the README header and added a navigation entry labeled “← cpp-linter org” to mkdocs.yml that points to the same site.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• cpp-linter/cpp-linter-action#442: Both PRs update README.md to add new cpp-linter ecosystem documentation links (this PR adds a cpp-linter hub badge/link, the related PR adds a TIP cross-reference to cpp-linter-hooks).

Suggested labels

documentation

Suggested reviewers

• 2bndy5

🚥 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 back-navigation link to the cpp-linter hub in documentation files (README.md and mkdocs.yml).
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 fix/add-back-navigation

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[2bndy5]