Replace iCheck JS with plain CSS to improve tabbing/accessability
Currently, Six theme uses iCheck to style checkboxes/radio inputs. It looks nice, but it's completely inaccessible. You can't tab through the options using keyboard. This means any user that uses keyboard to navigate can't make a selection.
iCheck has been abandoned and hasn't received any updates in several years. It's time to remove it and use plain CSS to style checkboxes and radio inputs.
Please refer to this example on how to use CSS to style checkboxes/radio inputs just like iCheck: