How can we develop this kind of tutorials sharing website

So here is the screenshot exactly what I want.
So this same UI is used by as well.
so I want to know is there any template for this?
What I observed they i storing the videos on Vimeo streaming platform and use their href attributes.

But how everyone have the same ui for sharing the tutorial. just that thing i want to know.

Gitbook or Docsify. Sample:

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