added thumbnail to posts page

content/blog/PrettyRivers/index.md

@@ -1,6 +1,7 @@
 +++
 date = '2024-01-01T19:13:02Z'
 title = 'Pretty rivers'
+image = 'wisconsin_rivers.png'
 +++
 
 I like maps that isolate different natural features. And I think that rivers make pretty patterns. So I made a series of scripts that generates a pretty map of rivers. I hope to print the maps of places that are important to me as art.

content/blog/RiverLevelCharts/index.md

@@ -1,6 +1,7 @@
 +++
 date = '2024-10-14T19:13:18Z'
 title = 'River level charts'
+image = 'example_last_6_months.png'
 +++
 
 I'm interested in rivers (both ecologically and recreationally) and I want to know