Clarify that this repo is not the same as lighthouse-ci on npm

[nolanlawson]

I got a bit confused because I only belatedly realized that https://www.npmjs.com/package/lighthouse-ci is not the same as this repo; it points to https://github.com/andreasonny83/lighthouse-ci.

Maybe this project could be published on npm as @ebidel/lighthouse-ci or something similar?

[ebidel]

Yea, I probably should get it published. That would be easy than having folks install the script directly from github source.