I think helpers are fine for the simpler ones that are basically *just*
wrapper tags, but once it starts getting into `concat`, I think that's
too unfamiliar of a syntax for developers; let's bail into our usual
templating system!
I'm not sure about putting them in `application/support_form` like this.
That's cute for one-offs like `application/hanger_spinner`, because
`render partial: "hanger_spinner"` assumes the `application` view folder
by default, but that doesn't work once it's nested: it looks for a
`views/support_form` folder.
I think maybe it could soon be time to bail from the strict "view
folders belong to controllers" thing, similar to how we did for
`SupportFormHelper`, and add a `components` folder or similar? Idk, not
sure yet!
Instead of hand-rolling HTML, this offers helpers like `f.field`, to
help ensure the HTML is consistent, and to keep the templates more
focused on the unique form elements.
