Add page descriptions for metadata previews

This adds a description field to blog posts and uses it for the HTML
meta description and Open Graph description, with the blog tagline
remaining as the fallback.

Archive, category, and tag pages now define their own descriptions so
previews are more specific instead of all sharing the same generic site
tagline.

1 files changed, 1 insertions, 0 deletions

diff --git a/templates/category.html b/templates/category.html
index 9d6b35d..fcd63eb 100644
--- a/templates/category.html
+++ b/templates/category.html
@@ -11,6 +11,7 @@
         href="{{ '/static/css/category.css'|asseturl }}">
 {% endblock %}
 {% set title = "Category " + this.name %}
+{% set description = "Posts in the category “" + this.name + "” on Still Thinking About It." %}
 {% block content %}
   {% set post_count = this.children.count() %}
   <article>