added privacy/tou urls

pxtarget.json

@@ -80,6 +80,8 @@
         "homeUrl": "https://m.pxt.io/",
         "embedUrl": "https://m.pxt.io/",
         "koduUrl": "https://www.kodugamelab.com/bbc-microbit/",
+        "privacyUrl": "https://go.microsoft.com/fwlink/?LinkId=521839",
+        "termsOfUseUrl": "https://go.microsoft.com/fwlink/?LinkID=206977",
         "visualStudioCode": true,
         "docMenu": [
             {