index: Improve UI for Korean
index: Improve UI for Korean

 * Remove useless links on the top side.
 * Remove duplicated intro.
 * Remove custom set. I won't maintain this feature.

Change-Id: Ib8cb8af00355e81d8525c0ff7576dfe191542737
Signed-off-by: lilymaniac <b2dad6778f566e937c17f7b9ada16427bd3e0ad5@outlook.com>

lilymaniac/calc,lilymaniac/calc