Improved code usabililty of upgrade unlocks

Assets/Scripts/Game/UpgradeManager.cs

@@ -88,7 +88,7 @@ namespace Fruitomation.Game
         }
     }
 
-    public class UpgradeManager : MonoBehaviour
+    public static class UpgradeManager
     {
         private static string Filepath => Path.Combine(Application.persistentDataPath, "upgrades.json");
         private static UnlockedUpgrades CurrentUpgrades;
@@ -119,10 +119,6 @@ namespace Fruitomation.Game
             File.WriteAllText(Filepath, json);
         }
 
-        public void UnlockBasicUpgrade(string id)
-        {
-            BasicUpgrade upgrade = Enum.Parse<BasicUpgrade>(id);
-            CurrentUpgrades.Unlock(upgrade);
-        }
+        public static void Unlock(BasicUpgrade upgrade) => CurrentUpgrades.Unlock(upgrade);
     }
 }