do not enable calendar by default

do not enable calendar by default

diff --git a/config/settings.yml b/config/settings.yml
index 9c7f087..e0b9fde 100644
--- a/config/settings.yml
+++ b/config/settings.yml
@@ -1,6 +1,6 @@
 plugins:
   calendar_enabled:
-    default: true
+    default: false
     client: true
   holiday_calendar_topic_id:
     default: ""

GitHub sha: cdce6fb0