fixed Ast photo and updated README

README.md

@@ -46,6 +46,7 @@ Alternately, you can manually add a file there in the proper format.
 
 Optionally you can add a headshot photo to your interview. To do this:
 
+0. Edit the headshot to be a square to ensure high image quality
 1. Place your image file in the `/assets/headshots/` directory
 2. Add a `headshot` field to your interview's front matter with just the filename. For example:
 

content/interviews/ast-decentralized_justice.md

@@ -6,7 +6,7 @@ date: 2025-01-31
 approved: 2025-09-25
 summary: "How a blockchain-based protocol is prefiguring an Internet-native justice system."
 topics: [conflict, economics, decentralization, mediation, open source, software]
-headshot: "federico_ast.jpg"
+headshot: "federico_ast.png"
 links:
   - text: "Personal website"
     url: "https://federicoast.com/"