Update to latest bootstrap (mdn#79)

Author: hamishwillee

catalog/migrations/0023_auto_20201201_0238.py

@@ -0,0 +1,22 @@
+# Generated by Django 3.1.2 on 2020-12-01 02:38
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('catalog', '0022_auto_20181028_1731'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='book',
+            options={'ordering': ['title', 'author']},
+        ),
+        migrations.AlterField(
+            model_name='book',
+            name='isbn',
+            field=models.CharField(help_text='13 Character <a href="https://www.isbn-international.org/content/what-isbn">ISBN number</a>', max_length=13, unique=True, verbose_name='ISBN'),
+        ),
+    ]

catalog/templates/base_generic.html

@@ -5,9 +5,8 @@
   {% block title %}<title>Local Library</title>{% endblock %}
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1">
-  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
-  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
-  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css" integrity="sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2" crossorigin="anonymous">
+
 
   <!-- Add additional CSS in static file -->
   {% load static %}