Add mail config message after installation

refs TryGhost#216
- adds a little ui message to guide people towards docs for mail config

Author: cobbspur

lib/commands/start.js

@@ -61,6 +61,11 @@ class StartCommand extends Command {
                 return this.ui.run(processInstance.enable(), 'Enabling instance startup on server boot');
             }).then(() => {
                 this.ui.log(`You can access your blog at ${instance.config.get('url')}`, 'cyan');
+
+                if (instance.config.get('mail.transport') === 'Direct') {
+                    this.ui.log('\nGhost uses direct mail by default', 'green');
+                    this.ui.log('To set up an alternative email method read our docs at https://docs.ghost.org/docs/mail-config', 'green');
+                }
             });
         });
     }