Fix profile image

Author: jeromewu

apps/website/blog/authors.yml

@@ -2,4 +2,4 @@ jeromewu:
   name: Jerome Wu
   title: Maintainer of ffmpeg.wasm
   url: https://github.com/jeromewu
-  image_url: https://github.com/jeromewu.png
+  image_url: /img/jeromewu.png