[STYLE] Nav tabs - disable pointer-events for <a> in active tab
[STYLE] Nav tabs - disable pointer-events for <a> in active tab

Signed-off-by: Pang Yan Han <22594c345857f664c61cd411f607c4d40a9d4af9@gmail.com>

yanhan/cljs-nusmods,yanhan/cljs-nusmods,yanhan/cljs-nusmods