fix: shimmer has the potential to cover images (cotes2020#1100)

Resolves cotes2020#1100

_javascript/modules/components/img-lazyload.js

@@ -1,15 +1,9 @@
 /**
- * Set up image lazy-load
+ * Setup image lazy-load
  */
 
 export function imgLazy() {
   if ($('#core-wrapper img[data-src]') <= 0) {
     return;
   }
-
-  /* Stop shimmer when image loaded */
-  document.addEventListener('lazyloaded', function (e) {
-    const $img = $(e.target);
-    $img.parent().removeClass('shimmer');
-  });
 }

_sass/addon/commons.scss

@@ -91,6 +91,7 @@ img {
       &.lazyloaded {
         -webkit-animation: fade-in 0.35s ease-in;
         animation: fade-in 0.35s ease-in;
+        z-index: 0;
       }
     }