chore(ci): adapt API reference workflow to new API

Adapted the API reference generation workflow to the new API, which no
longer requires the src/ structure.

.gitea/workflows/generate-api-reference.yml

@@ -39,7 +39,7 @@ jobs:
 
       - name: Generate documentation
         run: |
-          jcloud-docsgen python -T -f -o docs/reference .
+          jcloud-docsgen python -T -f -o docs/reference ./src
 
       - name: Commit and push
         run: |