Update production example configuration

config/production.yaml.example

@@ -25,11 +25,16 @@ storage:
   torrents: 'torrents/'
   cache: 'cache/'
 
+cache:
+  previews:
+    size: 1 # Max number of previews you want to cache
+
 admin:
   email: 'admin@example.com'
 
 signup:
   enabled: false
+  limit: 10 # When the limit is reached, registrations are disabled. -1 == unlimited
 
 # If enabled, the video will be transcoded to mp4 (x264) with "faststart" flag
 # Uses a lot of CPU!