Update docs/configuring-playbook-alertmanager-receiver.md: remove the direction to proceed to Usage

Such a kind of direction is not used on other documentation, so it should be fine to just remove it.

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/configuring-playbook-alertmanager-receiver.md

@@ -91,9 +91,6 @@ ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,ensure-matrix-use
 
   `just install-all` is useful for maintaining your setup quickly when its components remain unchanged. If you adjust your `vars.yml` to remove other components, you'd need to run `just setup-all`, or these components will still remain installed. For more information about `just` shortcuts, take a look at this page: [Running `just` commands](just.md)
 
-Then, you can proceed to [Usage](#usage).
-
-
 ## Usage
 
 Configure your Prometheus Alertmanager with configuration like this: