feat: fade in lazy loaded images

static/lazy.js

@@ -0,0 +1,13 @@
+window.onload = function(){
+
+  var lazyImages = [...document.querySelectorAll("img[loading='lazy']")];
+
+  for (let i = 0; i < lazyImages.length; i++) {
+    var element = lazyImages[i];
+    element.classList.add("lazy-image")
+    element.addEventListener("load", function(){
+      element.classList.add("loaded");
+    })
+  }
+
+}