feat!: abra app env pull

`abra app env` -> `abra app env list`.

See toolshed/abra#497

cli/app/undeploy.go

@@ -28,6 +28,7 @@ var AppUndeployCommand = &cobra.Command{
 	Use: i18n.G("undeploy <domain> [flags]"),
 	// translators: Short description for `app undeploy` command
 	Aliases: strings.Split(appUndeployAliases, ","),
+	Short:   i18n.G("Undeploy a deployed app"),
 	Long: i18n.G(`This does not destroy any application data.
 
 However, you should remain vigilant, as your swarm installation will consider