WIP: fix recipe part in the domain

I created a new app using this recipe and the domain wasn't automatically replaced, I'm guessing cause the part before the root domain didn't match the recipe name?

Just opening a PR real quick so I can get back to it and test the fix later when I have cycles

.env.sample

@@ -1,7 +1,7 @@
 TYPE=monitoring-ng
 LETS_ENCRYPT_ENV=production
 COMPOSE_FILE=compose.yml
-DOMAIN=monitoring.example.com
+DOMAIN=monitoring-ng.example.com
 #TIMEOUT=120
 ENABLE_BACKUPS=true