Publish work to streamshub website

[alexcreasy]

Once the other issues are complete the introduction and gitops-tutorial docs sections should be published to the streamshub website.

This will involve:

• Add entries to the streamshub-site sources.json
• Manually build the website locally to test
• Raise a PR to update streamshub-site with the correct sources.

[alexcreasy]

Closing as this issue belongs on the streamshub-site repository.