The bottom links, "next →" and "← previous", of each page of "Tour of Scala" are broken since those URLs are not given the suffix ".html". For example, http://docs.scala-lang.org/tour/basics.html is accessible, but http://docs.scala-lang.org/tour/basics, which is "next →" in http://docs.scala-lang.org/tour/tour-of-scala.html indicates, responds with "404 Not Found error". Note that running `bundle exec jekyll serve -I` in local works correctly.