Now, before we start getting things on GitHub and Heroku, we'll first set up a few things inside Atom. We need to set up a .gitignore file, which we'll provide in the root of the project.
Inside .gitignore, the only thing we'll be ignoring is the node_modules folder. We do not want to commit any of this code to our repo, because it can be generated using npm install and it's subject to change. It's a real pain to manage that sort of thing, and it is not recommended that you commit it.
The next thing we'll do is configure a few things for Heroku. First up, we have to use the process.env.PORT environment variable. I'll create a constant called port next to the publicPath variable, setting it equal to process.env.PORT ...
