Change assignment text widget to be rich text

Resolves MS-518

server/assignments/migrations/0014_alter_assignment_assignment.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.13 on 2022-06-15 15:40
+
+from django.db import migrations
+import wagtail.core.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('assignments', '0013_auto_20210315_2143'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='assignment',
+            name='assignment',
+            field=wagtail.core.fields.RichTextField(),
+        ),
+    ]

server/assignments/models.py

@@ -13,7 +13,7 @@ from core.constants import DEFAULT_RICH_TEXT_FEATURES
 @register_snippet
 class Assignment(index.Indexed, TimeStampedModel):
     title = models.CharField(max_length=255)
-    assignment = models.TextField()
+    assignment = RichTextField(features=DEFAULT_RICH_TEXT_FEATURES)
     solution = RichTextField(null=True, blank=True, features=DEFAULT_RICH_TEXT_FEATURES)
     deleted = models.BooleanField(default=False)
     owner = models.ForeignKey(get_user_model(),