Add alias for old packaging guide

It seems that quite a few people have added links to the packaging guide,
add in an alias to make sure we catch these when they've not been updated.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

content/guides/component_guide.md

@@ -5,6 +5,10 @@ weight = 100
 toc = true
 
 title = "Adding and Updating Components"
+
+aliases = [
+    "/guides/apertis_packaging_guide/",
+]
 +++
 
 Apertis stores the source of all the shipped packages in GitLab and uses a