Added and reformatted new gameplay into backgrounds.json

Just took the new entries from the old `CONSTANTS.py` and moved them here (and changed the format so that it works!)

utils/backgrounds.json

@@ -35,5 +35,29 @@
         "cluster_truck.mp4",
         "No Copyright Gameplay",
         480
+    ],
+    "minecraft-2": [
+        "https://www.youtube.com/watch?v=Pt5_GSKIWQM",
+        "minecraft-2.mp4",
+        "Itslpsn",
+        "center"
+    ],
+    "multiversus": [
+        "https://www.youtube.com/watch?v=66oK1Mktz6g",
+        "multiversus.mp4",
+        "MKIceAndFire",
+        "center"
+    ],
+    "fall-guys": [
+        "https://www.youtube.com/watch?v=oGSsgACIc6Q",
+        "fall-guys.mp4",
+        "Throneful",
+        "center"
+    ],
+    "steep": [ # Steep gameplay
+        "https://www.youtube.com/watch?v=EnGiQrWBrko",
+        "steep.mp4",
+        "joel",
+        "center"
     ]
-}
+}