var url = 'YOUR PAGE;
var p = SitesApp.getPageByUrl(url);
var html = p.getHtmlContent();
var blob = DriveApp.createFile('dummy',html, 'text/html').getBlob();
var resource = {
title: 'YOUR FILE NAME',
convert: true,
mimeType: 'application/vnd.google-apps.document'
};
Drive.Files.insert(resource,blob);