Docs: turn on Gordon chat cards in production (#26478)

## Description

#26452 added cards to Gordon's answers (steps, tables, notes, snippets,
follow-up questions), but shipped them off in production behind
`params.gordon.cards`. They've been on in local builds and deploy
previews, and Gordon's backend already supports them for the docs site.
This turns them on for docs.docker.com.

To roll back, set the flag back to `false`.

## Related issues or tickets

- #26452

## Reviews

- [ ] Technical review
- [ ] Editorial review
- [ ] Product review

hugo.yaml

@@ -170,7 +170,7 @@ params:
   gordon:
     # Lets Gordon answer with cards (steps, tables, notes, snippets, follow-up
     # questions) in production builds. Always on in other environments.
-    cards: false
+    cards: true
 
   # === Example versions ===
   # The following parameters are used in various ways in content and templates.