Implement clean deployment command

main.go

@@ -178,6 +178,16 @@ var commands = []Command{
 		IsVarargs:   false,
 
 		Action: func(requiredArguments []string, arguments []string) (string, error) {
+			if len(arguments) != len(requiredArguments) {
+				return "", fmt.Errorf("expected %s", requiredArguments[0])
+			}
+
+			if gameError := WithGame(arguments[0], func(game *Game) error {
+				return game.CleanDeployedMods()
+			}); gameError != nil {
+				return "", gameError
+			}
+
 			return "cleaned", nil
 		},
 	},