Resolve "Add dashboard widget for external link"

Closes #383 (closed)

aleksis/core/migrations/0010_auto_20210303_2004.py

+# Generated by Django 3.1.7 on 2021-03-03 20:04
+
+from django.db import migrations, models
+import django.db.models.deletion
+import django.utils.timezone
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0009_default_dashboard'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ExternalLinkWidget',
+            fields=[
+                ('dashboardwidget_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='core.dashboardwidget')),
+                ('url', models.URLField(verbose_name='URL')),
+                ('icon_url', models.URLField(verbose_name='Icon URL')),
+            ],
+            options={
+                'verbose_name': 'External link widget',
+                'verbose_name_plural': 'External link widgets',
+            },
+            bases=('core.dashboardwidget',),
+        ),
+    ]