Add read it later functionality (#304)

* Allow marking bookmarks as unread

* Restructure navigation to include preset filters

* Add mark as read action

* Improve description

* Highlight unread bookmarks visually

* Mark bookmarks as read by default

* Add tests

* Implement toread flag in importer

* Implement admin actions

* Add query tests

* Remove untagged link

* Update api docs

* Reduce height of description textarea

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

bookmarks/migrations/0014_alter_bookmark_unread.py

@@ -0,0 +1,27 @@
+# Generated by Django 3.2.13 on 2022-07-23 12:30
+
+from django.db import migrations, models
+
+
+def forwards(apps, schema_editor):
+    Bookmark = apps.get_model('bookmarks', 'Bookmark')
+    Bookmark.objects.update(unread=False)
+
+
+def reverse(apps, schema_editor):
+    pass
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('bookmarks', '0013_web_archive_optin_toast'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='bookmark',
+            name='unread',
+            field=models.BooleanField(default=False),
+        ),
+        migrations.RunPython(forwards, reverse),
+    ]