Set up a new docs collection within the b08x.github.io Jekyll site to host the documentation for the GitAgent Workbench project. This involves configuring the collection, setting up a central index and sidebar navigation, and creating a sync script to automatically pull the markdown files from the gitagent-workbench repository.
The goal is complete when the docs collection is configured in Jekyll, a /docs/ index page exists, the doc.html layout renders a sidebar based on _data/docs_nav.yml, and a script successfully copies documentation from gitagent-workbench into b08x.github.io/_docs/gitagent-workbench/.