Introduce eslint-plugin-prettier to the codebase
Now that the codebase is 'pretty' (https://leipert-projects.gitlab.io/is-gitlab-pretty-yet/prettier/), it could be worth adding [`eslint-plugin-prettier`](https://github.com/prettier/eslint-plugin-prettier). This would hand all enforcement of prettier rules over to eslint, which should mean that: - prettier command-line scripts are no longer required - the prettier extension is no longer needed in editors - auto-fix (e.g. on save) only runs once Overall, this should make setup (and on-boarding) easier for those that want to integrate their editors with both `eslint` and `prettier`. There may be downsides to this approach, please add your thoughts in the comments.
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