Remove config file from repository.

config.json

-[
-  {
-    "sqlHost": "localhost",
-    "sqlPort": "3306",
-    "sqlUser": "root",
-    "sqlPass": null,
-    "dbNames": "all",
-    "backupRoot": "/var/backups/sql1/",
-    "backupRetainDays": 30
-  }
-]