Upgrade Gatsby to Incremental Builds
My biggest problem was figuring out how to Enable Netlify Build Plugins.
When I went to select from the dropdown, nothing was visible. The problem was that my build image was set to Ubuntu Trusty 14.04, probably due to when I first setup my gatsby site, but in order to enable Netlify Build Plugins you have to be on Ubuntu Xenial 16.04. Once I switched the build image I was able to proceed with the guide without any issues.