fix: labels on toggle buttons are now clickable

[jrenee42]

  also adding pretty-quick
     - you can just call 'yarn pretty-quick' at the command line, and only the files you changed will get prettier run on them;
 it is so much quicker and easier to use  (takes 5-10 seconds instead of 2-3 minutes)

Closes #566

Changes

the on-click listener is now on the entire div; so that clicking on the children will toggle as well
(b/c of the explicit onclick handler, the 'for' linking the labels to the input does not toggle the button at all)

[TCL735]

This a new dependency and the only one listed under "dependencies". Seems like it is in the wrong place. I think we should move this to devDependencies.

[jrenee42]

so instead of doing

% yarn add pretty-quick

do:

% yarn add --dev pretty-quick

correct? @TCL735

[TCL735]

yeah i think so