docs(only-allow-pnpm): added option to enforce pnpm with package.json and .npmrc#692

karthikappiah wants to merge 4 commits intopnpm:mainpnpm/pnpm.io:mainfrom

karthikappiah:docs_only-allow-pnpm_engine-strict-truekarthikappiah/pnpm.io:docs_only-allow-pnpm_engine-strict-trueCopy head branch name to clipboard