remove notifier service

backend/internal/core/services/notifier/notifier.go

@@ -1,10 +0,0 @@
-// Package notifier exposes the notifier service for sending external messages.
-package notifier
-
-import "github.com/containrrr/shoutrrr"
-
-// Notify is a proxy method for shoutrrr.Send. May be removed if additional
-// functionality is _not_ needed.
-func Notify(url, message string) error {
-	return shoutrrr.Send(url, message)
-}