Update sample config

quovadis/config_sample.php

-<?
+<?php
 
-# email from address for emails generated by quovadis
-$QV_FROM = "[email protected]";
 
-# API key for desec.io
-$QV_DESEC_API = "ABCD1234";
+function get_config() {
+	return [
+		# email from address for emails generated by quovadis
+		'QV_FROM' => "[email protected]",
 
-# Domain at desec.io
-$QV_DOMAIN = "quovadis.ucc.asn.au";
+		# API key for desec.io
+		'QV_DESEC_API' => "ABCD1234",
 
-# passphrase for GPG
-$QV_PASSPHRASE = "hello cruel world";
+		# Domain at desec.io
+		'QV_DOMAIN' => "quovadis-challenges.ucc.asn.au",
 
-# GPG public key
-$QV_PUBLIC = "PUB";
+		# passphrase for GPG
+		'QV_PASSPHRASE' => "hello cruel world",
 
-# GPG private key
-$QV_PRIVATE = "PRIVATE";
+		# GPG public key
+		'QV_PUBLIC' => "PUB",
+
+		# GPG private key
+		'QV_PRIVATE' => "PRIVATE",
+	];
+}
 
 ?>