```ruby
require 'rails_zero/drivers/poltergeist'

RailsZero.configure do |c|
  c.site.add_path '/'
  c.deployment.url = 'git@github.com:cocoa-tree/cocoa-tree.github.io.git'
  c.deployment.git_binary = 'git'
end
```

Fix rails zero config for heroku.
user
```ruby
require 'rails_zero/drivers/poltergeist'

RailsZero.configure do |c|
  c.backend.url = 'http://cocoa-tree.herokuapp.com' if Rails.env.production?
  c.site.add_path '/'
  c.deployment.url = 'git@github.com:cocoa-tree/cocoa-tree.github.io.git'
  c.deployment.git_binary = 'git' unless Rails.env.production?
end
```
assistant