Add training level list

Plus various other fettling

training/migrations/0006_auto_20210903_2158.py

@@ -0,0 +1,23 @@
+# Generated by Django 3.1.7 on 2021-09-03 20:58
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('training', '0005_auto_20210819_1833'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='traininglevel',
+            name='icon',
+            field=models.CharField(blank=True, max_length=20, null=True),
+        ),
+        migrations.AlterField(
+            model_name='traininglevelrequirement',
+            name='depth',
+            field=models.IntegerField(choices=[(0, 'Training Started'), (1, 'Training Complete'), (2, 'Passed Out')]),
+        ),
+    ]