I'd recommend find and replace and replacing "physicalgraph" with "hubitat", which might get you most of the way there. This thread has a bit more: App and driver porting to Hubitat
In a note not related to porting but which may cause problems if you don't: it does look like you'll have to enable Oauth on the Connect app, in the event you have never used SmartThings and aren't familiar with how that works (pretty easy and almost the same if you have).
