Remove eslint dependency

[ruiquelhas]

eslint is currently required as a dependency because it's being used as a linter for the module itself since it has additional code to load the rules declared in yaml.

If the rules are expressed in a regular Node.js™ module using module.exports and the proper main file path in package.json, the dependency is no longer needed.

[ruimarinho]

👍 for this. We should look into the maintainers own config - https://www.npmjs.com/package/eslint-config-eslint.