Issue #185 - email signups now sent to the correct address

I added the staff_email address to the secrets file. Now, in every env except prod, the email will be sent to the dummy email address.
> I agree about removing the staging section. Do you want to update the pull request to do that?
> 
> We do have the ability to manage a bunch of ENV variables in the various environments. See the env_sample file at the root level and the README for more info about these. If you made the change to use an ENV variable like you suggested and defaulted the env_sample file to tech@beyondz.org then I would accept the pull request.

I'm closing this pull request because i just had to make the change requested above and it was easier to manually do in a fresh branch than this old one.