We don't currently have a Slider Module available sorry. We'll remove the old documentation as it refers to an experimental feature in the early days of Siteglide - unfortunately it doesn't meet the level of quality needed to be added on Live Sites.
If this is an important feature to you, perhaps you might like to make a feature request on the Roadmap?
I have seen other community members using https://kenwheeler.github.io/slick/28 but the best thing is to find a plugin that you find useful and easy to develop with.
Does this solution help?