chore: remove eslintrc export from eslint-config-eslint

[mdjermanovic]

Prerequisites checklist

• [x] I have read the contributing guidelines.

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update [ ] Bug fix (template) [ ] New rule (template) [ ] Changes an existing rule (template) [ ] Add autofix to a rule [ ] Add a CLI option [ ] Add something to the core [x] Other, please explain:

Removes eslintrc export from eslint-config-eslint so that we can publish v10 without it.

What changes did you make? (Give an overview)

1. Copied the content of packages/eslint-config-eslint/eslintrc.js directly into the root .eslintrc.js.
2. Removed packages/eslint-config-eslint/eslintrc.js file and the corresponding export from packages/eslint-config-eslint/package.json.
3. Also made a few updates to make this project lint-free when linted using .eslintrc.js.

Is there anything you'd like reviewers to focus on?

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[mdjermanovic]

I'm not sure why knip now considers eslint-config-eslint being unused.

[aladdin-add]

@mdjermanovic it has been merged, ready to release eslint-config-eslint v10. 😄