Modify the nunet adapter proto
currently, the browser extension is passing the requested url link to the rest api and then the rest api extract the headline and body from the page and pass it into the nunet adapter through grpc call. But now since the browser extension is going to call directly the nunet adapter with grpc, the rest api won't longer used. So the nunet adapter should handle the extraction/scrapping of headline and body so that the browser extension can send only the requested url link through grpc.