Create a brand new homepage

- [x] Use iPhone 6 instead of the iPhone 4
- [x] Use an iPad air instead of an old style iPad
- [x] Update Palaver screenshot
- [ ] Fix issues with Avenir
- [ ] Make "get in touch" actually work
- [x] Remove Facebook links
- [x] Background images
- [x] Parallax (not critical)
This should be a single slash.