Update personas images

[jhoude5]

Robots are great, but might be useful to have alternatives if folks find those aren't professional enough.

Hard to strip bias out of images of people though. Hair, color, piercings all are signals of gender, race etc.

Cats, dogs, robots avoid those trappings. Even androgynous people can cause controversy for some. That too has become something which some of us bring judgement.

Still, might be useful to have illustrations that look people like.