Standardize on sending anonymous notifications for asset checkouts

app/Models/User.php

@@ -263,20 +263,6 @@ class User extends SnipeModel implements AuthenticatableContract, AuthorizableCo
         return $this->last_name.', '.$this->first_name.' ('.$this->username.')';
     }
 
-    /**
-     * The url for slack notifications.
-     * Used by Notifiable trait.
-     * @return mixed
-     */
-    public function routeNotificationForSlack()
-    {
-        // At this point the endpoint is the same for everything.
-        //  In the future this may want to be adapted for individual notifications.
-        $this->endpoint = \App\Models\Setting::getSettings()->webhook_endpoint;
-
-        return $this->endpoint;
-    }
-
 
     /**
      * Establishes the user -> assets relationship