Enforcing node version throughout the app

[twinkarma]

Node version incompatibilities is causing a lot of issues for deployment. We need a way to enforce and synchronize node versions.

The root package.json seems like the most sensible location to specify our desired version. There's already a convention of doing this according to this thread:

https://stackoverflow.com/questions/29349684/how-can-i-specify-the-required-node-js-version-in-package-json

But we will also need to think about how this works with conda, docker and github workflow