Provide a iOS Shortcut to get auto_sourced RSS of website

[gildesmarais]

Background:
Sharing iOS Shortcuts is possible, see i.e.
https://shortcutsgallery.com/
https://support.apple.com/guide/shortcuts/discover-shortcuts-in-the-gallery-apdd018638ca/ios
https://matthewcassinelli.com/sirishortcuts/

The short should bring the user to: https://instance.tld/auto_source/?url=%s