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.
I think it's important to educate people about .env being in the gitignore. Could we add in a line like the following?

`.env` is in your `.gitignore`, in order to prevent your secret keys from being added to source control and shown publicly on GitHub or elsewhere. Make sure not to remove this line.