For the time being it should be enough to change the href value from:
'help' => array(
'title' => $txt['help'],
'href' => $scripturl . '?action=help',
'show' => true,
),
to:
'help' => array(
'title' => $txt['help'],
'href' => 'http://elkarte-erste-schritte.de/',
'show' => true,
),
in Subs.php.