Setup initial CI gating on tests and add linting tests (#85)

* add flake, black, mypy, and bandit to run

* fixes issues flake and black complained about

* make mypy run successfully, add configuration files rather than specifying in ci

* respond to feedback

* configure bandit, ignore a file used only in local development

src/manage.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python
 """Django's command-line utility for administrative tasks."""
-import os
 import sys
 
 
@@ -17,5 +16,5 @@ def main():
     execute_from_command_line(sys.argv)
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     main()