docs(cpt): update dates and remove image

Author: nerda-codes

tutorials/configure-slack-grafana-alerting/assets/scaleway-slack-alert-test.webp

@@ -8,8 +8,8 @@ content:
 categories:
   - cockpit
 dates:
-  validation: 2025-02-11
-  posted: 2025-02-11
+  validation: 2025-02-13
+  posted: 2025-02-13
 ---
 
 This page shows you how to create a Slack app, a Slack webhook, and your Slack integration in Grafana using the `Scaleway Alerting` alert manager, and how to configure notification policies to receive your Grafana alert notifications in your Slack channel.