Remove Make

[davidjgoss]

** What's the problem you've observed? 🤔 **

Make is used for some orchetration, and you need to run make locally before you can run the tests.

Not everyone has Make (e.g. Windows) or knows how to use it, and might be a bit surprising for a frontend developer approaching this project to contribute.

** Do you have a proposal for making it better? 🦄 **

What we're going with Make is pretty minor, this could be moved into the npm prepare script meaning it's handled as part of npm install.

[aslakhellesoy]

Yeah it’s just a bit of file concatenation to do codegen. Can be done in a js file we call from npm.