Remove subnet router visibility workaround from docs

[nblock]

Previous Headscale versions required a dedicated rule to make a subnet router visible to clients. This workaround is no longer required.

• have read the CONTRIBUTING.md file
• raised a GitHub issue or discussed it on the projects chat beforehand
• added unit tests
• added integration tests
• updated documentation if needed
• updated CHANGELOG.md

[ghost]

Pull Request Revisions

Revision	Description
r1	Simplified ACL and routes documentation Removed redundant network routing rules and simplified documentation for subnet router and ACL configuration in two markdown files

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✅ AI review completed for r1

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[kradalby]

Great 🎉