STC: add activity info to config

src/Jackett.Common/Definitions/skipthecommercials-api.yml

@@ -46,6 +46,10 @@ settings:
     options:
       desc: desc
       asc: asc
+  - name: info_activity
+    type: info
+    label: Account Inactivity
+    default: "Inactivity on the SkipTheCommercials web site for more than 90 days will lead to account being disabled."
 
 login:
   path: /api/torrents