Suggestion: Prettier

[curran]

I notice much of the code formatting is internally inconsistent. It would be great to adopt Prettier to auto-format the code.

Example: /backend/src/app.js

app.get("/api/invalidate", (req, res, next) => {
  let request = Object.assign({}, requests.invalidate);
  request.data = {
    'access_token': accessToken
  }

  return axios(request)
           .then(r => {
             return res.json("OK");
           })
           .catch(next);
});

app.get("/api/finished/:conferenceId", (req, res) => {
  console.log("received finished for: ", req.params.conferenceId);
  let request = Object.assign({}, requests.url);
  request.url = request.url.replace(/%conferenceId%/g, req.params.conferenceId);

  axios(request)
    .then((res) => console.log(res))
    .catch(e => console.error(e));

  return res.end();
});

This could be done by adding the following script in package.json:

  "scripts": {
    "prettier": "prettier --single-quote --write 'src/**/*.js'",
  },

Would this be a welcome change?