Serve uploaded content from Nginx rather than Flask.
Remove workflow graphics.
Add a status banner in place of process flow graphic.
Add Status model.
Revert "Add Status model."

This reverts commit 86bac91d742844cc526a7a6d5028a308cc7be1cc.
Handle all possible bill status combinations in a dropdown.
Render simple text-based status indicator.
Merge branch 'process-flow'
Remove Stage and Location models.
Fix rendering of location & Stage in template.