The npm module has been updated since then, so no more need to manually link to the rs.js repo now.
Yesterday the guide has also been updated to the 0.11.0 situation (slightly different way to call RemoteStorage.Discover and remoteStorage.remote.configure than in rs.js 0.10), so make sure to update to the latest version.
As a stop-gap until these guides are moved to remotestorage.io, I also added a link to it on http://remotestorage.io/integrate/ (“Node JS Client” on the left), and a generic link to “technical docs” at the bottom of that page, linking to the doc/ folder of rs.js, where you can find more in-depth guides about various (advanced) topics.