Style guide checker

[frederickobrien]

This is way, way down the line, something to think about if/when we make the leap to a custom CMS. The Guardian is a great example of this, and their code for it is open source.

Worth a read, @andrewbridge, I think you'd find it interesting: https://www.theguardian.com/info/2021/jan/26/how-we-made-typerighter-the-guardians-style-guide-checker