Failed checks `site.yml` --> `site.prod.yml`

[mmattel]

What Type Of Content Change Is This?

• New Content Addition
• Old Content Deprecation
• Existing Content Simplification
• Bug Fix to Existing Content

Which Manual Does This Relate To?

• Admin Manual
• Developer Manual
• User Manual
• General

What Needs to be Documented?

Error:
antora generate --cache-dir cache/ --redirect-facility netlify site.yml error: playbook file does not exist
site.yml --> site.prod.yml

Why Should This Change Be Made?

Fix failed checks, see
#222
#224

@settermjd