Beta content

:warning: Not ready for merging!

Just wanted to start this thread up. Still to do:

- [x] Progress graphs
  - [ ] IE8 fallback needs some tweaking
- [ ] Beta banner
- [ ] Replace SVG with smaller bitmap images?
I think so, it's worth a shot at it because we're way more likely to remember to do it if it's in cf-enhancements than if it's here.