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

This is falcon v3.1.2

_dev/js/theme/utils/debounce.js

@@ -0,0 +1,8 @@
+export default function debounce(func, timeout = 300) {
+  let timer;
+
+  return (...args) => {
+    clearTimeout(timer);
+    timer = setTimeout(() => { func.apply(this, args); }, timeout);
+  };
+}