index.php include firestore

<?php

print <<<EOF

<!doctype html>
<html>
<!-- The core Firebase JS SDK is always required and must be listed first -->
<script src="https://www.gstatic.com/firebasejs/7.14.2/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/7.11.0/firebase-firestore.js"></script>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="index.js"></script>

<style>
//...