Revert package-lock.json to v1
Revert package-lock.json to v1

Despite https://github.com/npm/cli/issues/1905
being fixed for `npm@7.1.2`, there are still
issues with installing `puppeteer` using `npm@7`.

See https://github.com/puppeteer/puppeteer/issues/6586#issuecomment-754038437

Therefore, we're reverting the accidental schema
upgrade from 0d1e40bf6d1603791764330947c25e7877f4956c to
the previous version, and removing
`markdownlint-cli` once more.

cjohansen/Sinon.JS,cjohansen/Sinon.JS,cjohansen/Sinon.JS