Epic tracking the work to migrate from NextJS -> Webpack bundle.

This includes:

• Remove next dependencies
• Create a webpack.config.js -> create bundle
• Update our static server logic
  • Remove nextrouter routing logic
  • Redirect all routes to common index.html w/ bundle
  • Validate caching still works correctly (invalidated when bundle is new using a cache-buster strategy, but cached when same)
• Move routing to use local react-router
• Compare before and after bundle sizes + total network download