Update docs/configuring-playbook-traefik.md: add a copyright header

Suguru Hirahara · Suguru Hirahara · commit c72b8f1726fa · 2025-03-05T00:26:55.000+09:00
Signed-off-by: Suguru Hirahara &lt;acioustick@noreply.codeberg.org&gt;
diff --git a/docs/configuring-playbook-traefik.md b/docs/configuring-playbook-traefik.md
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+<!--
+SPDX-FileCopyrightText: 2023 - 2024 Slavi Pantaleev
+SPDX-FileCopyrightText: 2024 - 2025 MDAD project contributors
+SPDX-FileCopyrightText: 2024 - 2025 Suguru Hirahara
+SPDX-FileCopyrightText: 2024 Ed Geraghty
+
+SPDX-License-Identifier: AGPL-3.0-or-later
+-->
+
 # Configuring the Traefik reverse-proxy (optional, advanced)
 
 By default, this playbook installs and manages a [Traefik](https://doc.traefik.io/traefik/) reverse-proxy server, powered by the [ansible-role-traefik](https://github.com/mother-of-all-self-hosting/ansible-role-traefik) Ansible role for you. If that's okay, you can skip this document.
