Adds a cover image

web/blog/2020-10-03-supabase-alpha-september-2020.md

@@ -1,11 +1,12 @@
 ---
 title: Supabase Alpha September 2020
-description: Seven months of building
+description: Seven months of building.
 author: Paul Copplestone
 author_title: Supabase
 author_url: https://github.com/kiwicopple
 author_image_url: https://avatars2.githubusercontent.com/u/10214025?s=400&u=c6775be2ae667e2acae3ccd347fed62bb3f5b3e7&v=4
 authorURL: https://github.com/kiwicopple
+image: /img/supabase-september-2020.png
 tags: 
     - supabase
 ---