Tidy up blog section (a bit)

Signed-off-by: David Young <davidy@funkypenguin.co.nz>

docs/blog/category/changelog.md

@@ -0,0 +1,8 @@
+---
+description: CHANGELOG - What's new in the cookbook
+---
+# CHANGELOG
+
+This category lists the posts which highlight new and improved recipes in Funky Penguin's Geek Cookbook. The idea is that subscribing to the [RSS feed](/rss/) will provide automatic notification of fresh recipes!
+
+--8<-- "common-links.md"