The landing page is on the gh-pages branch of the repo. I filed an issue for it here: https://github.com/scoutapp/scout_realtime/issues/6
Only reason I didn't file a PR myself was I wasn't sure what the best replacement would be (dev? sysadmin?), but this should be easy enough to fix if they're amenable.
EDIT: "Developer" as an alternative was merged very quickly. https://github.com/scoutapp/scout_realtime/pull/7