Add description and website to github homepage

[jnachtigall]

On https://github.com/mozilla-neutrino/neutrino-dev/ there's "No description or website provided." which makes this project look, well, immature ;)

[helfi92]

@jnachtigall The documentation link at the end of the README takes you to the website but you're right, we probably need to add the website as well in the description. Thanks for the feedback!

[tj]

A link to the repo on https://neutrino.js.org/ would probably be good too, I didn't see one

[helfi92]

@tj I added a link to https://neutrino.js.org right beside the repo description

[tj]

Just my 0.02 but I'd put it on the Introduction page for anyone who lands there, and doesn't dig into https://neutrino.js.org/contributing/development.html. I tweeted the site but people might have to hunt around a bit to find the repo