Implemented multiple campaign support via a campaign directory registry with explicit campaign IDs

examples/pipeline.full.annotated.yml

@@ -27,6 +27,12 @@ storage:
     access_key_id_env: OBJECT_STORAGE_KEY_ID
     secret_access_key_env: OBJECT_STORAGE_KEY
 
+campaigns:
+  # Optional; defaults to /usr/local/share/narratio/campaigns.
+  root: /usr/local/share/narratio/campaigns
+  # Optional command default when --campaign is omitted.
+  default_campaign_id: sample-campaign
+
 spool:
   # Optional; defaults to /var/spool/narratio.
   root: /var/spool/narratio