Migrate ESLint config file to new syntax

[MindTooth]

Seems I've left some bits out of #458 and it needs some updating.

Guide: https://eslint.org/docs/latest/use/configure/migration-guide#configuring-language-options

[MindTooth]

@roosta some of the options in eslint.config.js, do you have a relation to them? Like the custom parser, etc. I'm asking as it require some changes to transfer them over.

Cleaned it down to:

// ESLint Config

import js from "@eslint/js";
import eslintConfigPrettier from "eslint-config-prettier";
// import babelParser from "@babel/eslint-parser";

const config = [
  js.configs.recommended,
  // {
  //   files: ["**/*.js", "**/*.mjs"],
  //   languageOptions: {
  //     parser: babelParser,
  //   },
  // },
  eslintConfigPrettier,
];

//   {
//   env: {
//     browser: true,
//     node: true,
//     es2021: true,
//   },
//   extends: ["eslint:recommended", "prettier"],
//   parserOptions: {
//     ecmaVersion: 13,
//     sourceType: "module",
//   },
//   rules: {
//     "no-unused-vars": "warn",
//   },
// };

export default config;

---

I actually found a few bugs:

/Users/birgerjn/Sites/srcery.sh/src/main.js
  54:3  error  Duplicate key 'lua'      no-dupe-keys
  69:3  error  'window' is not defined  no-undef

[roosta]

Feel free to change it, I might have used some of those settings for the fetch data script, but some or all of it might have been lazily copied from a different project.