Setup GitHub Actions

[DeveloperBlue]

Add GitHub actions to ensure

• [ ] Code builds
• [x] ESLint / Prettier checks
• [ ] Send http request to the server's /update endpoint to request rebuild

[DeveloperBlue]

In the future, since we're building the project anyway, we can forward the build files to the server; this will save memory on the server since it doesn't have to fetch the updates with git and build a second time.