add necessary config to log users in
begin edit_race view
implement minimal view/form/template to edit a race
initial success with form to edit a race's laps
complete update race form flow; update race, update laps, done. not persisting it all yet
successfully edit race lap times. still need to support zeroing lap times
if a lap value isn't specified in edit race form, delete that lap from db if it exists
add Race.num_laps field; update edit race logic; start using migrations