Add option for showing bookmark favicons (#390)

* Implement favicon loader

* Implement load favicon task

* Show favicons in bookmark list

* Add missing migration

* Load missing favicons on import

* Automatically refresh favicons

* Add enable favicon setting

* Update uwsgi config to host favicons

* Improve settings wording

* Fix favicon loader test setup

* Document LD_FAVICON_PROVIDER setting

* Add refresh favicons button

bookmarks/migrations/0018_bookmark_favicon_file.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.1 on 2023-01-07 23:42
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookmarks', '0017_userprofile_enable_sharing'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='bookmark',
+            name='favicon_file',
+            field=models.CharField(blank=True, max_length=512),
+        ),
+    ]