chore: export base config from eslint-config-eslint

[mdjermanovic]

Prerequisites checklist

• 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:

Refs eslint/eslint.org#512 (comment)

Adds base export in the eslint-config-eslint package.

Configs exported from the main and cjs entry points are intended for files that run in Node.js, and therefore cannot be readily used for files that don't run in Node.js, like browser scripts or modules that will be bundled for use in browsers, as we have in the eslint/eslint.org project.

What changes did you make? (Give an overview)

Added the new export in package.json, and updated README with an example of when and how to use it.

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

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[nzakas]

LGTM.