Host docs in datakit

[samoht]

Currently with host the API docs on our local server, and everything is very manual. Would be nice if we can integrate this in the rest of the CI flow (e.g. re-publish automatically on every PR, in a location available to all).

Note: usually Github pages are great for that, but they don't work well for private repos (ie they are public).

[talex5]

Now that DataKit is public, we should be able to do this.