docs: further server docs [ci skip]

cli/server/server.go

@@ -11,8 +11,15 @@ var ServerCommand = &cli.Command{
 	Usage:   "Manage servers via 3rd party providers",
 	Description: `
 These commands support creating and managing servers using 3rd party
-integrations. Servers can be provisioned from scratch so that they are capable
-of hosing Co-op Cloud apps.
+integrations. 
+
+Servers can be created and provisioned from scratch so that they are capable of
+hosing Co-op Cloud apps. This can be achieved by using the "abra server new"
+command.
+
+If you already have a server, you can add it to your configuration using "abra
+server add". Abra can provision existing servers also, see available flags on
+"server add" for more.
 `,
 	Subcommands: []*cli.Command{
 		serverNewCommand,