Support Ruby 4.0 and mark 3.1 as legacy

[christopher-b]

Resolves #53

Bare minimum self-checks

• I've updated this PR with the latest code from main
• I've done a cursory QA pass of my code locally
• I've ensured all automated status check and tests pass
• I've connected this PR to an issue

Pieces of flare

• I've written a unit or functional test for my code
• I've updated relevant documentation it my code changes it
• I've updated this repo's README if my code changes it
• I've updated this repo's CHANGELOG with my change unless its a trivial change (like updating a typo in the docs)

Finally

• I've requested a review with relevant people

---

Note

• Support added: Enables ruby:4.0 in builder (supported list) and documentation; examples include new examples/4.x with configs and sample servers
• Legacy update: Moves 3.1 to legacy in builder and docs; 3.x examples adjusted off 3.1
• Docs refreshed: README/basic usage now ruby:4.0; multiple docs links updated to new docs.lando.dev paths; supported/legacy/version snippets updated (including patch example 4.0.x)
• Changelog: Notes Ruby 4.0 support and 3.1 legacy
• CI/docs tooling: Netlify checklinks config expanded to flag hub.docker.com

^{Written by Cursor Bugbot for commit 3feccbd. This will update automatically on new commits. Configure here.}

[netlify]

✅ Deploy Preview for lando-ruby ready!

Name	Link
🔨 Latest commit	3feccbd
🔍 Latest deploy log	https://app.netlify.com/projects/lando-ruby/deploys/69714248fa778f0008214fca
😎 Deploy Preview	https://deploy-preview-54--lando-ruby.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 85 (🟢 up 7 from production) Accessibility: 98 (no change from production) Best Practices: 100 (no change from production) SEO: 100 (no change from production) PWA: - View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[AaronFeledy]

bugbot run

[cursor]

✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

[AaronFeledy]

Thanks @christopher-b!