Maybe I'm looking at it backwards...thinking website content first and then Nostr. This would be the opposite approach, which is still valid, but it would mean hosting my main site on Nostr relays instead of my current traditional host. 

 An import tool would fix that. You’d press a button and get your latest ghost cms articles into nostr. But it doesn’t exist yet as far as I know. 

Needs to though! 

 There is a tool for one-time import from Ghost https://npub.pro/import-ghost

But there isn't one to continuously monitor Ghost using it's API and to republish everything from Ghost to Nostr, if that's what you need.