🎨 Do not stretch author profile image (#365)

- add `object-fit: cover` to `.author-profile-image` to prevent non-square images being stretched/squashed

assets/css/screen.css

@@ -459,6 +459,7 @@ The knock-on effect of this is ugly browser-scroll bars at the bottom, so 80px o
     height: 25px;
     margin-right: 5px;
     border-radius: 100%;
+    object-fit: cover;
 }
 
 .post-card-author {