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.
> Does that mean the staging code is never executed or assigned? Perhaps it would be good to remove this from the file, as its presence implies that it is being used.
> 
> Do you currently have the ability to set different ENV variables in prod and staging? If so, you could assign the staff_email in this file to <%= ENV['STAFF_EMAIL'] %>

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.