Use `javascript:void(0)` for `href` value of tab <a>
Use `javascript:void(0)` for `href` value of tab <a>

so that the location hash isn't changed when we click on the tab links.

As explained by various answers here:

    http://stackoverflow.com/questions/134845/href-attribute-for-javascript-links-or-javascriptvoid0

This is probably the best solution to the problem.

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

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