Hook up common positions API with frontend redux data store

[valarao]

Overview

This PR hooks up the backend common positions API with the frontend redux data store. I also did a bunch of minor code cleanups as well.

Cleanups

• Removed react-router-dom from backend package.json and added it to the frontend package.json
• Fixed a compiler complaint about something being labeled class instead of className
• Redux devtools added to the store for visibility into redux store during previews