docs: moved Slack in the sidebar to Notifications (#1715)

www/docs/sidebars.js

@@ -279,17 +279,6 @@ module.exports = {
             },
           ],
         },
-        {
-          type: "category",
-          label: "Bot",
-          items: [
-            {
-              type: "doc",
-              id: "add-plugins/slack",
-              label: "Slack",
-            },
-          ],
-        },
         {
           type: "category",
           label: "CMS",
@@ -339,6 +328,11 @@ module.exports = {
               id: "add-plugins/twilio-sms",
               label: "Twilio SMS",
             },
+            {
+              type: "doc",
+              id: "add-plugins/slack",
+              label: "Slack",
+            },
           ],
         },
         {