Website: update documentation to use npm instead of make.
Website: update documentation to use npm instead of make.

Progress on #7.

scrapp-uk/spfjs,nicksay/spfjs,nicksay/spfjs,youtube/spfjs,scrapp-uk/spfjs,tchiotludo/spfjs,nicksay/spfjs,tchiotludo/spfjs,youtube/spfjs,tchiotludo/spfjs,youtube/spfjs,nicksay/spfjs,tchiotludo/spfjs,tchiotludo/spfjs,theanh/spfjs,youtube/spfjs,youtube/spfjs,theanh/spfjs,theanh/spfjs,theanh/spfjs,scrapp-uk/spfjs,scrapp-uk/spfjs,theanh/spfjs,scrapp-uk/spfjs,nicksay/spfjs