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"

docs/blog/category/note.md

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+---
+description: Funky Penguin's notes-in-progress
+---
+# Notes
+
+Sometimes you discover something which doesn't fit neatly into the "recipe" format. That's what this category of blog posts is for. I note information I don't want to loose, but I don't know (yet) how to fit it into the structure of the cookbook.
+
+--8<-- "common-links.md"

docs/blog/category/review.md

@@ -0,0 +1,7 @@
+---
+description: My reviews of popular self-hosted apps
+---
+
+I love experimenting with new self-hosted tools. Typically I'll review a tool while creating a recipe, although popular enough tools (*like [Plex][plex]*) don't **need** a review, in which case I'll just jump straight into the recipe!
+
+--8<-- "common-links.md"