Refactor UI / CSS / Design

[skluck]

The frontend css is a bit of a mess and hasn't given proper attention in a while. This is a technical debt refactor and clean-up.

• [ ] Identify core components used in the UI
• [ ] Prototype core pages and optimize all design for them
  • [ ] Application dashboard
  • [ ] Applications list
  • [ ] Dashboard
  • [ ] Run Build
  • [ ] Deploy Release
  • [ ] Manage targets
• [ ] Switch to foundation for css framework (http://foundation.zurb.com/sites/docs/kitchen-sink.html) or semantic ui (https://semantic-ui.com)
• [ ] Switch to left sidebar-based menu (instead of top nav)