Add utility function min() in math-utils
Find author matching given author id
Display author name in author card
Replace commas with semicolons at end of instructions
Display author information in author card

Only the chapter is missing. I also intend to add the group name,
in a title bar on top of the card, if possible in the same color
used for the circles of the group.
Position the author card on top of everything else

I moved the author card to the end of the body to draw it last,
on top of everything else.
Add the group name, as a legend including color, in card title