fix: make react-photo-album show thumbnails without stretching

Author: ahnl

styles/globals.css

@@ -72,3 +72,7 @@ small, figcaption {
   font-size: 0.9em;
   color: rgba(255,255,255,0.5) !important;
 }
+
+.react-photo-album--image {
+  object-fit: cover;
+}