refactor: Replace Pushover notifications with

Apprise integration.

This commit updates the second Cloudplow configuration by replacing the
existing Pushover notifications with a new Apprise/Discord integration.
The
Apprise integration allows users to receive upload status notifications
on a Discord channel via a webhook.

docs/reference/cloudplow.md

@@ -209,13 +209,12 @@ This config uploads everything from `/mnt/local/Media` to `google:/Media` [trigg
     },
     "hidden": {},
     "notifications": {
-        "Pushover": {
-            "app_token": "xxxxx",
-            "priority": 0,
-            "service": "pushover",
-            "user_token": "xxxxx"
-        }
-    },
+    "apprise": {
+      "service": "apprise",
+      "url": "discord://Webhook_ID/Webhook_Token",
+      "title": "Cloudplow-Upload"
+    }
+  },
     "nzbget": {
         "enabled": false,
         "url": "https://user:[email protected]"