Add more artist images

software/backend/data/bands.json

@@ -243,7 +243,7 @@
         {
           "name": "Phil Harvey",
           "bandId": 3,
-          "image": "phil-harvey.jpg"
+          "image": "phil-harvey.png"
         }
       ],
       "ratings": [
@@ -459,7 +459,7 @@
         {
           "name": "Chris Wolstenholme",
           "bandId": 7,
-          "image": "christ-wolstenholme.jpg"
+          "image": "chris-wolstenholme.jpg"
         }
       ],
       "ratings": [