I need to totally remove from my hard drive all files related to a website built on Rapidweaver 7.
That’s going to be hard to answer since we would have no way to know what resources(i.g. Images, copy) you used and how you included them in your project.
If you just want to remove the RapidWeaver part, just delete the project file.
If you published the file locally, then delete the folder from your Mac.
Depending on what you mean by “ totally remove” you may want to empty your trash after deleting.