New icon for iPad
Changed side-bar menu <div> for <nav> and its id camelCased name for dashed one

Also, added border detail to 'Edit subs' buttons section
Huge code refactor

Separating stuff into big "Model", "View" and "Controller" sections -
although not trying to recreate any particular MVC arquitecture.
Just an effort to keep code a bit more organized.

No new functionality added.
Changed main icon