really add h5, h6 and blockquote as features in rich text editor

dnscms/dnscms/wagtail_hooks.py

@@ -0,0 +1,6 @@
+from wagtail import hooks
+
+
+@hooks.register("register_rich_text_features")
+def enable_additional_rich_text_features(features):
+    features.default_features.extend(["h5", "h6", "blockquote"])