UI updates to include "overlay kind"

internal/app/wwctl/overlay/list/root.go

@@ -6,20 +6,18 @@ import (
 
 var (
 	baseCmd = &cobra.Command{
-		Use:   "list [flags] [overlay name]",
+		Use:   "list [flags] <overlay kind> <overlay name>",
 		Short: "List Warewulf Overlays and files",
 		Long: "This command will show you information about Warewulf overlays and the\n" +
 			"files contained within.",
 		RunE:    CobraRunE,
 		Aliases: []string{"ls"},
 	}
-	SystemOverlay bool
-	ListContents  bool
-	ListLong      bool
+	ListContents bool
+	ListLong     bool
 )
 
 func init() {
-	baseCmd.PersistentFlags().BoolVarP(&SystemOverlay, "system", "s", false, "Show system overlays instead of runtime")
 	baseCmd.PersistentFlags().BoolVarP(&ListContents, "all", "a", false, "List the contents of overlays")
 	baseCmd.PersistentFlags().BoolVarP(&ListLong, "long", "l", false, "List 'long' of all overlay contents")