Add documentation for routes

[nblock]

• Rename exit-node to routes and add redirects
• Add a new section on subnet routers
• Extend the existing exit-node documentation
• Describe auto approvers for subnet routers and exit nodes
• Provide ACL examples for subnet routers and exit nodes
• Describe HA and its current limitations
• Add a troubleshooting section with IP forwarding

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• 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
r2	Added comprehensive routes documentation Created a new detailed routes.md documentation covering subnet routers, exit nodes, auto-approvers, and related configuration details
r1	Added comprehensive routes documentation Created a new detailed documentation file for routes, covering subnet routers, exit nodes, and related configuration details

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✅ AI review completed for r2

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[ghost]

The JSON comments in the ACL examples (lines 137-138 and 255-256) use JavaScript-style comments (// more rules). JSON doesn't technically support comments, so while this works for documentation, it might be confusing if users try to copy and paste these examples directly. Consider using a proper JSON format or adding a note that these comments should be removed before use.

[kradalby]

Looks great!, thank you!