Gatsby cookiecutter template

[beamalsky]

Overview

This PR adds a cookiecutter template for a DataMade-style Gatsby app to docker/templates. It's based on gatsby-starter-default but includes Bootstrap setup, a Github Action for linting, and is containerized.

@jeancochrane or @hancush, I'd love to hear your thoughts on the containerization here. When I'm developing a Gatsby project and add or delete a dependency, I have to stop and rebuild the container. Is there a way I can modify my Dockerfile here so that it live updates node_modules?

Testing

• Follow the instructions in the README here to set up a new Gatsby app
• Follow the 🚀 Quick start guide in your new directory's README to run the site

[beamalsky]

Thanks @hancush! I've added edits based on your comments. After a little investigative work I believe that the Jinja error you noted above was caused by the double brackets of JSX syntax, eg:

  <header
    style={{
      background: `#e49fb2`,
      marginBottom: `1.45rem`,
    }}
  />

An unfortunate collision, but I've gotten around it by adding a line in cookiecutter.json to avoid rendering the culprit files, as this comment recommends: https://stackoverflow.com/a/39151217

[beamalsky]

@hancush I've set this up with a global styles sheet! Let me know if this looks good to merge. I'll open a PR now in testing guidelines