Make Internet Archive integration opt-in (#250)

* Make web archive integration opt-in

* Add toast message about web archive integration opt-in

* Improve wording for web archive setting

* Add toast admin

* Fix toast clear button visited styles

* Add test for redirect

* Improve wording

* Ensure redirects to same domain

* Improve wording

* Fix snapshot test

Co-authored-by: Sascha Ißbrücker <sascha.issbruecker@gmail.com>

bookmarks/migrations/0013_web_archive_optin_toast.py

@@ -0,0 +1,30 @@
+# Generated by Django 3.2.6 on 2022-01-08 19:27
+
+from django.db import migrations
+from django.contrib.auth import get_user_model
+
+from bookmarks.models import Toast
+
+User = get_user_model()
+
+
+def forwards(apps, schema_editor):
+    for user in User.objects.all():
+        toast = Toast(key='web_archive_opt_in_hint',
+                      message='The Internet Archive Wayback Machine integration has been disabled by default. Check the Settings to re-enable it.',
+                      owner=user)
+        toast.save()
+
+
+def reverse(apps, schema_editor):
+    Toast.objects.filter(key='web_archive_opt_in_hint').delete()
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('bookmarks', '0012_toast'),
+    ]
+
+    operations = [
+        migrations.RunPython(forwards, reverse),
+    ]