Add some new hooks for the account/create page

Also moved some account-create text to plugins

plugins/account-create-hint/hint.php

@@ -0,0 +1,15 @@
+<?php
+/**
+ * account-create index.php
+ *
+ * @package   MyAAC
+ * @author    Slawkens <slawkens@gmail.com>
+ * @copyright 2020 MyAAC
+ * @link      https://my-aac.org
+ */
+defined('MYAAC') or die('Direct access not allowed!');
+
+global $twig_loader;
+$twig_loader->prependPath(BASE . 'plugins/account-create');
+
+$twig->display('hint.html.twig');