Support categories again, but hopefully a bit better

archetypes/blog/index.md

@@ -10,6 +10,9 @@ draft: true
 authors:
   - {{ with .Site.Author.name }}{{ . }}{{ else }}John Doe{{ end }}
 
+categories:
+  - archetype-stuff
+
 tags:
   - awesome
 

archetypes/categories/_index.md

@@ -0,0 +1,15 @@
+---
+
+title: {{ replace .Name "-" " " | title }}
+
+---
+
+A short summary of what the category is about.
+
+<!--more-->
+
+Optionally provide more information about the category here. This part will only
+show on the category page, not on the category list page.
+
+If you delete this section, DO NOT delete the summary separator (`<!--more-->`)
+or else the summary won't be shown.