feat: add Homebrew cask distribution workflow

[bepyan]

Summary

• Add update-homebrew.yml workflow to automatically update Homebrew Cask formula on release publication
• Add Homebrew installation section to landing page with copyable install commands

Test plan

• Create nexters/homebrew-moa repository
• Set up initial Casks/moa.rb in tap repo
• Add HOMEBREW_TAP_TOKEN secret to this repo
• Publish a release and verify workflow execution
• Verify Casks/moa.rb updates with correct SHA256 hashes

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/homebrew-cask-deploy

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