Fix concourse pipeline for docs gen

[jrodewig]

Description

Adds a missing step to the release pipeline for docs.

Motivation and context

Without this step, we can't autogen + publish docs on release. 😢 See https://concourse.faunadb.net/teams/devex/pipelines/js-driver-release-v10/jobs/release/builds/42

How was the change tested?

fly validate-pipeline --config concourse/pipeline.yml
looks good

Screenshots (if appropriate):

Change types

• • Bug fix (non-breaking change that fixes an issue)
• • New feature (non-breaking change that adds functionality)
• • Breaking change (backwards-incompatible fix or feature)

Checklist:

• • My code follows the code style of this project.
• • My change requires a change to Fauna documentation.
• • My change requires a change to the README, and I have updated it accordingly.

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