chore: MP source

Author: VsevolodX

other/materials_designer/uploads/0-Ni.json

@@ -54,7 +54,7 @@
   },
   "external": {
     "id": "mp-23",
-    "source": "Materials Project",
+    "source": "MaterialsProject",
     "doi": "10.17188/1199153",
     "url": "https://next-gen.materialsproject.org/materials/mp-23",
     "origin": true