Add parallax and reveal effects + performances on transitions

src/style/molecules/_photo.scss

@@ -84,7 +84,7 @@
                 background-color: $color-primary;
                 display: block;
                 z-index: 3;
-                transition: all 150ms ease-in-out;
+                transition: opacity 150ms $ease-inout;
             }
         }