docs: add @types/eslint__js to Quickstart.mdx

[Tanavya]

Without this, I was getting an error Could not find a declaration file for module '@eslint/js'. In VS Code, in the following eslint.config.js from the Getting Started guide:

// @ts-check

import eslint from "@eslint/js";
import tseslint from "typescript-eslint";

export default tseslint.config(
  eslint.configs.recommended,
  ...tseslint.configs.recommended,
);

PR Checklist

• Addresses an existing open issue: fixes #000
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

[typescript-eslint]

Thanks for the PR, @Tanavya!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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✅ Successfully ran 31 targets

• nx test eslint-plugin --coverage=false
• nx test eslint-plugin
• nx test typescript-estree --coverage=false
• nx test visitor-keys --coverage=false
• nx test utils --coverage=false
• nx test typescript-eslint --coverage=false
• nx run types:build
• nx test type-utils --coverage=false
• nx test eslint-plugin-internal --coverage=false
• nx test repo-tools --coverage=false
• nx test scope-manager --coverage=false
• nx run repo-tools:postinstall-script
• nx test parser --coverage=false
• nx test rule-schema-to-typescript-types --coverage=false
• nx test visitor-keys
• nx test type-utils
• nx test utils
• nx run-many --target=lint --parallel --exclude eslint-plugin
• nx test ast-spec --coverage=false
• nx test typescript-estree
• nx run-many --target=build --parallel --exclude=website --exclude=website-eslint
• nx test scope-manager
• nx test eslint-plugin-internal
• nx test typescript-eslint
• nx test rule-schema-to-typescript-types
• nx test ast-spec
• nx test repo-tools
• nx test parser
• nx run integration-tests:test
• nx run-many --target=typecheck --parallel
• nx run repo-tools:generate-configs

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[JoshuaKGoldberg]

This seems reasonable to me. Though, we should also hear from @bradzacher who's done a lot here too. Thanks for sending!