Suppress System logging

Author: Tsingis

src/Api/appsettings.json

@@ -1,15 +1,9 @@
 {
-  "Logging": {
-    "LogLevel": {
-      "Default": "Information",
-      "Microsoft": "Information",
-      "Microsoft.AspNetCore": "Warning"
-    }
-  },
   "Serilog": {
     "MinimumLevel": {
       "Default": "Information",
       "Override": {
+        "System": "Warning",
         "Microsoft": "Information",
         "Microsoft.AspNetCore": "Warning"
       }