Revert "ESLint configured for JavaScript 5 on Node"

[scottleibrand]

Reverts #1152 due to breakage of npm run global-install - https://gitter.im/nightscout/intend-to-bolus?at=5bfb7577a115c91ef7932640

@edwingustafson can you see if you can figure out what about this commit is causing the issue?

[edwingustafson]

Not sure how adding a new script lint could interfere with existing one global-install. But I can resubmit the ESLint configuration files only, without adding eslint to the project. That is sufficient to provide editor warnings.

[scottleibrand]

Yeah, I don't know why that's a problem. I can't really test it effectively myself, as when I don't seem to have eslint installed:

~/src/oref0 $ npm run lint

> [email protected] lint /home/sleibrand/src/oref0
> eslint .

sh: 1: eslint: not found

But I agree, just leaving the npm stuff reverted and re-PR'ing the other stuff should be safe.