RK-A2

When user "thumbs down" an answer, increment thumbs_down field's value (starting at 0) for the styled_question entry. If same user clicks on thumbs down again, please decrement the value.

When user "thumbs up" an answer, increment thumbs_up field's value (starting at 0) for the styled_question entry. If same user clicks on thumbs up again, please decrement the value.

We are using two separate values deliberately so that we can get more user signals.