Optimized embedded tutorial for mobile

Change-Id: I0b345c75cbd68bd1f1205a313ddbb7ecd94b58c3
diff --git a/templates/doc/korap/karang.html.ep b/templates/doc/korap/karang.html.ep
index 67772a6..5c60d48 100644
--- a/templates/doc/korap/karang.html.ep
+++ b/templates/doc/korap/karang.html.ep
@@ -1,6 +1,6 @@
 % layout 'main', title => 'KorAP: Karang';
 
-<h2>Karang</h2>
+<h2 id="tutorial-top">Karang</h2>
 
 %= korap_overview 'karang'