docs: try to clarify that further [ci skip]

cli/server/add.go

@@ -242,7 +242,7 @@ func deployTraefik(c *cli.Context, cl *dockerClient.Client, domainName string) e
 
 var serverAddCommand = &cli.Command{
 	Name:  "add",
-	Usage: "Add a new server",
+	Usage: "Add a server to your Abra configuration",
 	Description: `
 This command adds a new server to your configuration so that it can be managed
 by Abra.