feat(motd): add mention of bbrew to motd (#867)

Author: inffy

system_files/shared/usr/share/ublue-os/motd/template.md

@@ -8,7 +8,7 @@ Hello, stargazer.
 | `ujust --choose`  | Show available commands  |
 | `ujust toggle-user-motd` | Toggle this banner on/off | 
 | `ujust aurora-cli` | Enable terminal bling | 
-| `brew help` | Manage command line packages | 
+| `brew help` or `bbrew` | Manage command line packages | 
 
 %TIP%