refactor: domainName as arg and doc strings

See coop-cloud/organising#163.

cli/server/new.go

@@ -241,10 +241,14 @@ environment variable or otherwise passing the "--env/-e" flag.
 }
 
 var serverNewCommand = &cli.Command{
-	Name:        "new",
-	Usage:       "Create a new server using a 3rd party provider",
-	Description: "Use a provider plugin to create a new server which can then be used to house a new Co-op Cloud installation.",
-	ArgsUsage:   "<provider>",
+	Name:    "new",
+	Aliases: []string{"n"},
+	Usage:   "Create a new server using a 3rd party provider",
+	Description: `
+Use a provider plugin to create a new server which can then be used to house a
+new Co-op Cloud installation.
+`,
+	ArgsUsage: "<provider>",
 	Subcommands: []*cli.Command{
 		serverNewHetznerCloudCommand,
 		serverNewCapsulCommand,