Experiment: Server side rendering

[mshenfield]

Most of the page load time to DOMContentLoaded is taken up rendering the React components. There might be a good tradeoff to render the React components server side.

Walmart Labs has thought through the tradeoffs and how to make SSR work well.

Since we already have node.js installed, and we are only using the Flask app as an API because it wraps sklearn, it might be better to build the react server side rendering into a simple node-based server we expose directly (e.g this StackOverflow answer)