docs(router): fix broken swan-io/chicane link in overview.md

[sanjibani]

Replaces https://swan-io.github.io/chicane/ (404, retired GitHub Pages deployment) with https://github.com/swan-io/chicane (200, canonical repo).

Summary by CodeRabbit

• Documentation
  • Updated the Chicane library acknowledgement in the router documentation to direct users to its official GitHub repository instead of a third-party reference. Added a clarification note that the previously referenced external documentation site is no longer deployed or available.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 892f9180-bf7d-4cb1-9c16-e311b731bd92

📥 Commits

Reviewing files that changed from the base of the PR and between 279a849 and 04b9b22.

📒 Files selected for processing (1)

• docs/router/overview.md

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📝 Walkthrough

Walkthrough

The Chicane acknowledgement link in docs/router/overview.md is updated from the previously hosted docs URL to the GitHub repository URL (github.com/swan-io/chicane), with a parenthetical note added stating the docs site is no longer deployed.

Changes

Chicane Link Update

Layer / File(s)	Summary
Update Chicane acknowledgement URL docs/router/overview.md	Changes the Chicane hyperlink from the old hosted docs URL to the GitHub repository URL and adds a note that the docs site is no longer deployed.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~1 minute

Poem

A link grew stale, the docs site gone away,
So the rabbit dug a new path to GitHub today.
One line changed, one URL set right,
The chicane still runs — just follow the light! 🐇✨

🚥 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: fixing a broken documentation link in the router's overview.md file by updating the Chicane acknowledgement reference.
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

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