fixed access to userguide

public/main.html

@@ -212,7 +212,7 @@
 	</div>
 
 	<div class="hilfe">
-        <p> <a href="/pdf/Benutzerhandbuch.pdf" target="_blank"><button class="lang" id="Handbuch"  key="userguide">User Guide</button></a></p>
+        <p> <a href="/3dclient4simstadtapi/public/pdf/Benutzerhandbuch.pdf" target="_blank"><button class="lang" id="Handbuch"  key="userguide">User Guide</button></a></p>
     </div>
 
 	<!--Sidebar-->