TASK: Add headlines to unwanted tags

Author: markusguenther

Classes/Service/ContentService.php

@@ -168,6 +168,12 @@ protected function stripUnwantedTags(string $content): string
                 '/\<\\/a\\>/',
                 '/\\<span[^\\>]+\\>/',
                 '/\\<\\/span>]+\\>/',
+                '/\\<h1[^\\>]+\\>/',
+                '/\\<\\/h1>]+\\>/',
+                '/\\<h2[^\\>]+\\>/',
+                '/\\<\\/h2>]+\\>/',
+                '/\\<h3[^\\>]+\\>/',
+                '/\\<\\/h3>]+\\>/',
                 '/\\<\\\\?(strong|b|blockquote)\\>/'
             ],
             '',