Optimized embedded tutorial for mobile

Change-Id: I0b345c75cbd68bd1f1205a313ddbb7ecd94b58c3
diff --git a/templates/doc/api/user.html.ep b/templates/doc/api/user.html.ep
index 12fa82e..0967a6d 100644
--- a/templates/doc/api/user.html.ep
+++ b/templates/doc/api/user.html.ep
@@ -1,5 +1,5 @@
 % layout 'main', title => 'KorAP: User API';
 
-<h2>User API</h2>
+<h2 id="tutorial-top">User API</h2>
 
 %= doc_uc