If you’re running RW 7 and you had your publishing settings to backup to the server. Then you could reload the project file back from the server assuming you recovered the backup as well.
If all you did was delete the site from the server, you should still have the project file on your Mac or perhaps a time machine backup.
There’s no way to create a project file from a published site other than to copy and paste from the website to a new RW project.