cleanup + fixing links

metainfo.json

 {
   "authors": [
-    "Cs\u00e1nyi, G\u00e1bor",
+    "Csányi, Gábor",
     "Kermode, James R."
   ],
   "email": "gc121@cam.ac.uk",
   "title": "Learning atomic charges",
   "description": "In this tutorial, we will use Gaussian process regression, GPR (or equivalently, Kernel Ridge Regression, KRR) to train and predict charges of atoms in small organic molecules.",
   "url": "https://gitlab.mpcdf.mpg.de/nomad-lab/analytics-soap-atomic-charges",
-  "link": "/jupyterhub/hub/user-redirect/notebooks/tutorials/soap-atomic-charges/soap-atomic-charges.ipynb",
-  "created": "",
-  "updated": "2017-09-29",
+  "link": "https://analytics-toolkit.nomad-coe.eu/hub/user-redirect/notebooks/tutorials/soap_atomic_charges.ipynb",
+  "link_public": "https://analytics-toolkit.nomad-coe.eu/public/user-redirect/notebooks/tutorials/soap-atomic-charges.ipynb",
+  "updated": "2019-06-01",
   "flags": {
     "featured": true,
-    "isPublic": true,
     "top_of_list": false
   },
   "labels": {