removing one of the environment setup options

@beechnut I like your .env documentation better than the template.env style. 
.env is already in the gitignore, so there is already a barrier to unsuspecting people committing their keys.
Unrelated to this PR: we should send some emails to other local shelters and ask if this would be useful to them.

Related to this PR: how about including a link to https://help.ubuntu.com/community/CronHowto