build.i3wm.org: disallow search engine indexing (#4295)
build.i3wm.org: disallow search engine indexing (#4295)

related to https://github.com/i3/i3.github.io/issues/41
i3/i3,Airblader/i3,stapelberg/i3,Airblader/i3,Airblader/i3-original,Airblader/i3-original,stapelberg/i3,Airblader/i3,Airblader/i3,i3/i3,i3/i3,stapelberg/i3,Airblader/i3-original,i3/i3,Airblader/i3-original,Airblader/i3-original,stapelberg/i3