Update links to previous Perth LCA conferences

Author: jhenstridge

content/projects/_index.md

@@ -12,4 +12,4 @@ Occasionally PLUG undertakes a project for members. Members decide what projects
 ## Past Projects
  * [Linux.conf.au 2014](https://web.archive.org/web/20150317044216/http://lca2014.linux.org.au/)
  * [PLUG Logo Competition 2011](logo-competition.md)
- * [Linux.conf.au 2003](https://linux.org.au/conf/2003/)
+ * [Linux.conf.au 2003](https://mirror.linux.org.au/pub/linux.conf.au/2003/)