docs: add adaptive Campaign composition guide

src/govoplan_campaign/backend/manifest.py

@@ -28,6 +28,7 @@ from govoplan_core.core.modules import (
 from govoplan_core.db.base import Base
 from govoplan_campaign.backend.change_tracking import register_campaign_change_tracking
 from govoplan_campaign.backend.db import models as campaign_models  # noqa: F401 - populate Campaign ORM metadata
+from govoplan_campaign.backend.documentation import documentation_topics
 
 register_campaign_change_tracking()
 
@@ -544,6 +545,7 @@ manifest = ModuleManifest(
             },
         ),
     ),
+    documentation_providers=(documentation_topics,),
     capability_factories={
         CAPABILITY_CAMPAIGNS_ACCESS: lambda context: __import__(
             "govoplan_campaign.backend.capabilities",