Expenses chart component with React/SVG/D3.js

Very keen for any feedback on the implementation of my D3.js graph into React, or any accessibility tips for the graph that I've missed. I aimed to make keyboard navigation and SR-compatibility work well in this solution.

This was a really cool challenge that gave me an opportunity to spend some quality time with D3.js, which I've been meaning to look at for a while.

I'm also pretty proud of achieving responsive design with no media queries here - as someone who clung to media queries for all of life's device size problems while learning front-end, it's nice to finally be at a point where I'm using enough modern CSS to not require a single media query. Yay!