Separated laravel app to its own folder (#540)

api/app/Service/HtmlPurifier/HTMLPurifier_URIScheme_notion.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace App\Service\HtmlPurifier;
+
+class HTMLPurifier_URIScheme_notion extends \HTMLPurifier_URIScheme
+{
+    public $browsable = true;
+
+    public $may_omit_host = true;
+
+    public function doValidate(&$uri, $config, $context)
+    {
+        if ($uri->host == 'www.notion.so' || $uri->host == 'notion.so') {
+            return true;
+        } else {
+            return false;
+        }
+    }
+}