fix: sort organisations by name within groups

Resolves #115

people/migrations/0053_organisation_order_name.py

@@ -0,0 +1,17 @@
+# Generated by Django 2.2.10 on 2021-05-09 12:51
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('people', '0052_allow_multiple_nationalities'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='organisation',
+            options={'ordering': ['name']},
+        ),
+    ]