Add some missing configuration settings.

These settings are used in the deployed instance and mentioned elsewhere
in the README, but were missing from the base INI file and the
Configuration Guide section of the README.

.secrets.baseline

@@ -3,7 +3,7 @@
     "files": "^.secrets.baseline$|^.*pgsslrootcert.yml$",
     "lines": null
   },
-  "generated_at": "2019-12-03T19:44:47Z",
+  "generated_at": "2019-12-05T17:54:05Z",
   "plugins_used": [
     {
       "base64_limit": 4.5,
@@ -98,7 +98,7 @@
         "hashed_secret": "afc848c316af1a89d49826c5ae9d00ed769415f3",
         "is_secret": false,
         "is_verified": false,
-        "line_number": 21,
+        "line_number": 29,
         "type": "Secret Keyword"
       }
     ],