[ISSUE-3/4] Adds test container and tooling (#8)

* Adding black, isort, and flake8 to pytest

* Applying black, flake8, and isort to codebase

comic/models.py

@@ -1,6 +1,6 @@
 import uuid
 import zipfile
-from os import path, listdir
+from os import listdir, path
 
 from django.conf import settings
 from django.contrib.auth.models import User