Update .npmignore

[udivankin]

exclude .editorconfig .eslintignore .eslintrc from bundling to npm package

[ljharb]

no, these are intentionally included so that npm explore qs && npm install && npm test always works.

[ljharb]

Duplicate of #400. Duplicate of #389. Duplicate of #356. Duplicate of #250.

The only files that currently show up in npm pack --dry-run that could be excluded are .github/FUNDING.yml - every other file is 100% necessary in the published package.

[udivankin]

Well, I've read #250 and it still feels a bit weird for me.
What about putting a short notice in .gitignore explaining why these were intentionally opted out

[ljharb]

Given that there's an explicit .npmignore file, it seems like a reader should expect that there is a reason without any additional comment, instead of assuming that it's a mistake.

The presence of the .npmignore file hasn't stopped people from filing PRs with the "files" field, and I suspect a comment in either .gitignore or .npmignore would also not achieve the desired effect :-/