feat(main): Add base theme: This is the falcon theme out of the box.

This is falcon v3.1.2

falcon/_dev/js/theme/components/Lazyload.js

@@ -0,0 +1,21 @@
+import LazyLoad from 'vanilla-lazyload';
+
+class PageLazyLoad {
+  constructor({ selector = '.lazyload' } = {}) {
+    this.selector = selector;
+    this.lazyLoadInstance = null;
+    this.init();
+  }
+
+  init() {
+    this.lazyLoadInstance = new LazyLoad({
+      elements_selector: this.selector,
+    });
+  }
+
+  update() {
+    this.lazyLoadInstance.update();
+  }
+}
+
+export default PageLazyLoad;