update

this will be a pretty major update. ~~hope to get it done by friday.~~

## Todo

- [x] finish remaining updates (just a couple pages)
- [x] make sure there are no unreferenced images
- [x] write payments article/section
- [x] signatures article
> If you don't want to collect names and email addresses from your respondents (or if you want them to be anonymous),

Redundant?

I would say:

> If you don't want to collect names and email addresses, or want to collect them in a different format than the default