Gatsby theme for docs website

[aarangara]

Hi, I am asking a general question if anyone can help me.

I am trying to implement a documentation website using gatsby and was wondering what theme is used for the official gatsby docs website (https://www.gatsbyjs.com/docs/how-to/) ? is it the official starter blog/notes theme? If it is something else, then what is it?

If this is not the right place then I please point me to the right place.