- Copy 211 distro icons from distros-gallery-v3 branch
- Add Distros and All links to navigation in web-create script
- Fix download modal to use releaseInfo.downloads when available
- Show actual distro icons with onerror fallback to colored placeholder
- Add CSS for disabled download links
- Add link-check.yml workflow for external link validation
Co-authored-by: openhands <openhands@all-hands.dev>