about: update boutell URL

Author: vapier

content/pages/about.rst

@@ -60,7 +60,7 @@ Contribute
 See `Contribute to LibGD`_.
 
 
-.. _Thomas Boutell: http://www.boutell.com/
+.. _Thomas Boutell: https://boutell.dev/
 .. _Pierre Joye: https://github.com/pierrejoye
 .. _valuable contributors: https://github.com/libgd/libgd/graphs/contributors
 .. _PHP.net: http://php.net/
@@ -90,4 +90,4 @@ See `Contribute to LibGD`_.
 .. _Github Discussions: https://github.com/libgd/libgd/discussions
 .. _Gitter Chat: https://gitter.im/libgd/libgd
 .. _Mailing list: http://news.php.net/php.gd.devel/
-.. _Contribute to LibGD: https://github.com/libgd/libgd/blob/master/CONTRIBUTING.md
+.. _Contribute to LibGD: https://github.com/libgd/libgd/blob/master/CONTRIBUTING.md