Revert "site: use cdn to improve performance, close: #3646"

This reverts commit 47f56eab23.

components/date-picker/createPicker.tsx

@@ -50,6 +50,7 @@ export default function createPicker(TheCalendar) {
     clearSelection(e) {
       e.preventDefault();
       e.stopPropagation();
+      this.setState({ value: null });
       this.handleChange(null);
     },