many signup and space management fixes

cookbook/migrations/0127_remove_invitelink_username.py

@@ -0,0 +1,17 @@
+# Generated by Django 3.2.3 on 2021-06-07 14:21
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cookbook', '0126_alter_userpreference_theme'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='invitelink',
+            name='username',
+        ),
+    ]