Place these files here:
- flatpickr.min.css  (v4.6.13) from https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.13/flatpickr.min.css
- flatpickr.min.js   (v4.6.13) from https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.13/flatpickr.min.js
