feat: simplify flag parsing in apps plugin

Commands should be written such that they take arguments as is.

plugins/apps/functions.go

@@ -86,26 +86,6 @@ func destroyApp(appName string) error {
 	return nil
 }
 
-func getAppName(args []string) (appName string, err error) {
-	if len(args) >= 1 {
-		appName = args[0]
-	} else {
-		err = errors.New("Please specify an app to run the command on")
-	}
-
-	return
-}
-
-func getNewAppName(args []string) (appName string, err error) {
-	if len(args) >= 2 {
-		appName = args[1]
-	} else {
-		err = errors.New("Please specify an new app name")
-	}
-
-	return
-}
-
 func listImagesByAppLabel(appName string) ([]string, error) {
 	command := []string{
 		common.DockerBin(),