chore(docs): render docs with latest docsonnet

[Duologic]

ref: https://github.com/jsonnet-libs/docsonnet/pull/50

This will allow us to render the docs using either go-jsonnet or jrsonnet without generating a diff.

[malcolmholmes]

I see no mention of docsonnet here, you are just using a local one? Could be just a Makefile?

[Duologic]

The Makefile runs jb update which pulls in the new version.