Add RSS feeds (#305)

* Add basic unread bookmarks feed

* Generate user-specific feed

* Add feed tests

* Add all bookmarks feed

* Add feed token admin

* Add note about renewing URLs

* Add support for query parameter

* Fix rebase issues

* Improve docs on feeds integration

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

bookmarks/migrations/0015_feedtoken.py

@@ -0,0 +1,24 @@
+# Generated by Django 3.2.13 on 2022-07-23 20:35
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('bookmarks', '0014_alter_bookmark_unread'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='FeedToken',
+            fields=[
+                ('key', models.CharField(max_length=40, primary_key=True, serialize=False)),
+                ('created', models.DateTimeField(auto_now_add=True)),
+                ('user', models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, related_name='feed_token', to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+    ]