ducky/web: a641906b8267 src/styles/hero.scss

Enable catch-all in our ValidationError component. We're doing this an ugly, hacky way. But it works, and right now, that's what counts. To match our params/fields/headers properties on the ValidationError component, we're going to add the notParams/notFields/notHeaders properties--they match any error _not_ targeting those params/fields/headers. Basically, "any error that wouldn't be caught by these filters". Which is an ugly, but workable, solution for a catch-all ValidationError--just tell it to catch anything but the params/fields/headers that are being handled by the other ValidationErrors. Our implementation of this in the RegisterPage component validates (ha!) that it's at least workable model, if not overly pretty. Also, I anticipate some human error bugs in the future, where one of the field-specific ValidationErrors gets updated and the catch-all ValidationError does not. But whatever. For now, this is Good Enough™.