docs: website license is CC-BY and code samples are CC0

docs/markdown/legal.md

@@ -1,6 +1,15 @@
 # Legal information
 
-Meson is copyrighted by all members of the Meson development team. For details see the <tt>authors.txt</tt> file that comes with the source code. Meson is licensed under the [Apache 2 license](https://www.apache.org/licenses/LICENSE-2.0).
+Meson is copyrighted by all members of the Meson development team. For details see the <tt>authors.txt</tt> file that comes with the source code. Meson is licensed under the [Apache 2 license].
 
 Meson is a registered trademark of Jussi Pakkanen.
 
+## Website licensing
+
+The meson website content is released under [Creative Commons Attribution-ShareAlike 4.0 International].
+
+All code samples on the website are released under [CC0 1.0 Universal].
+
+[Creative Commons Attribution-ShareAlike 4.0 International]: https://creativecommons.org/licenses/by-sa/4.0/
+[CC0 1.0 Universal]: https://creativecommons.org/publicdomain/zero/1.0/
+[Apache 2 license]: https://www.apache.org/licenses/LICENSE-2.0

docs/theme/extra/templates/license.html

@@ -0,0 +1,7 @@
+@require(license, logo_path)
+
+<hr/>
+
+<div class="license-description">
+    Website licensing information are available on the <a href=legal.html>Legal</a> page.
+</div>