This is the second phase of updating sonar's dependencies. Many of these

ones are focused more on the frontend side of things, including updating

to newer versions of react.
This also switches us over to using the "module" type in package.json.

This tells node that we're operating using ES6 modules rather than

CommonJS imports. This eliminates the need to use babel-node, which

simplifies things considerably and should improve performance a lot. The

one casualty of this is the newrelic integration, which would need

external configuration (since apparently the newrelic.js file can't be

loaded in ESM mode). I don't really care about newrelic monitoring here,

so this is fine for now.
I've also deleted the old load-old-data.js script. This was used when

we moved the data storage over from MongoDB to SQL, but isn't necessary

anymore.

Logged in and checked various features. In particular, tested parts of

the UI affected by the selectize update (things like group membership

selectors), and React-MDE (the status report markdown editor).