use local bootstrap for tests

Author: Archmonger

tests/test_app/templates/bootstrap_form.html

@@ -7,11 +7,8 @@
     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <link rel="shortcut icon" type="image/png" href="{% static 'favicon.ico' %}" />
-    <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet"
-        integrity="sha384-rbsA2VBKQhggwzxH7pPCaAqO46MgnOM80zW1RWuH61DGLwZJEdK2Kadq2F9CUG65" crossorigin="anonymous">
-    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"
-        integrity="sha384-kenU1KFdBIe4zVF0s0G1M5b4hcpxyD9F7jL+jjXkk+Q2h455rYXK/7HAuoJl+0I4"
-        crossorigin="anonymous"></script>
+    {% bootstrap_css %}
+    {% bootstrap_javascript %}
     <title>ReactPy</title>
     <style>
         iframe {