Migrate from CJS to ESM

[danielemery]

In #59 vite was upgrade to v5. Vite has now deprecated usage of CommonJS and a warning is shown on build.

Quizlord should be updated to use ESM.

[danielemery]

There is a good gist going over the steps here https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c