Developer task

[i-am-david-liu]

Task I will be working on
Issue #191.

Functionality to add
If Issue #191 is closed successfully, list of photographers when editing custom images will be sorted alphabetically.

What the finished version will look like
See above

Documentation & references

• https://github.com/thepoly/pipeline/blob/master/core/models.py
• https://docs.wagtail.io/en/stable/reference/contrib/modeladmin/indexview.html