add reuse header

README.qmd

+<!--
+SPDX-FileCopyrightText: 2023 Nicolas Fontrodona
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
+
 ![CC-BY-4.0](https://i.creativecommons.org/l/by/4.0/88x31.png)
 The full documentation of this work is lecensed under a
 [Creative Commons Attribution 4.0 International License (CC BY

index.qmd

+<!--
+SPDX-FileCopyrightText: 2023 Nicolas Fontrodona
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
+
 ---
 title: "Git Borg Linker"
 ---

license.qmd

+<!--
+SPDX-FileCopyrightText: 2023 Nicolas Fontrodona
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
+
 ---
 title: "AGPL3"
 ---

slides/slides.qmd

+<!--
+SPDX-FileCopyrightText: 2023 Nicolas Fontrodona
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
+
 ---
 title: "Git Borg Linker"
 title-slide-attributes:

slides/style.css

+/*
+SPDX-FileCopyrightText: 2023 Nicolas Fontrodona
+
+SPDX-License-Identifier: CC-BY-4.0
+*/
+
 .reveal .slide-background.present {
     background-color: rgb(243, 243, 243);
 }