fixing typo + removing unused keys

metainfo.json

@@ -2,7 +2,7 @@
   "authors": [
     "Regler, Benjamin",
     "Scheffler, Matthias",
-    "Ghiringhelli, Luca M.",
+    "Ghiringhelli, Luca M."
   ],
   "email": "regler@fhi-berlin.mpg.de",
   "title": "Total cumulative mutual information",
@@ -10,10 +10,8 @@
   "url": "https://gitlab.mpcdf.mpg.de/nomad-lab/analytics-tcmi",
   "link": "https://analytics-toolkit.nomad-coe.eu/hub/user-redirect/notebooks/tutorials/tcmi.ipynb",
   "link_public": "https://analytics-toolkit.nomad-coe.eu/public/user-redirect/notebooks/tutorials/tcmi.ipynb",
-  "created": "2020-01-14",
   "updated": "2020-01-14",
   "flags": {
-    "isPublic": false,
     "featured": false,
     "top_of_list": false
   },