Fixed the card script. (see details)

Previous script would change any number with a ':' before it, including `numAnswers` :(

Fixed:
awk '{gsub("\"id\"\:[0-9999]*\,","\"id\":"NR",",$0);print}' < cards.js | sed -e "s/,$//g" | sed -e "s/$/,/g" | tac |awk '/a/ && !seen {sub(/,$/, ""); seen=1} 1' | tac > output.js