Document to use API Key and not token

config.json.example

@@ -1,7 +1,7 @@
 {
     "port": 8000,
     "email": "<user email>",
-    "token": "<user token>",
+    "token": "<user API key (not API token)>",
     "whitelist": [
         "example.com",
         "this can be null to disable whitelist"