Code cleanup

[phil-d-wilson]

closes #29
closes #26

[phil-d-wilson]

@balena-ci I self-certify!

[ghost]

An error occurred whilst building your landr site preview:

{
  "name": "JSONHTTPError",
  "status": 429,
  "json": {
    "code": 429,
    "message": "You have reached a limit for sites. Please contact support for further assistance."
  },
  "message": "Too Many Requests",
  "stack": "JSONHTTPError: Too Many Requests\n    at parseResponse (/usr/src/app/node_modules/netlify/src/methods/response.js:13:11)\n    at runMicrotasks (<anonymous>)\n    at processTicksAndRejections (internal/process/task_queues.js:95:5)\n    at async callMethod (/usr/src/app/node_modules/netlify/src/methods/index.js:33:26)\n    at async Object.exports.setupSite (/usr/src/app/lib/netlify.js:59:18)\n    at async Object.exports.run (/usr/src/app/lib/build-runner.js:84:7)\n    at async build (/usr/src/app/bot/index.js:105:19)\n    at async /usr/src/app/bot/index.js:158:23"
}