Update content and add navigation.

Merge 'development' changes into 'master.'

- Move the registry links into same container as logo.
- Create navigation menu to quickly scroll the page.
- Add scroll back to top functionality.
- Remove heart animation container after completion.
- Change media queries from device-width to width.
- Restructure header to allow for a toggle menu on mobile.
- Fix issue with text extending off mobile.
- Move accommodations information to index view.
- Update registry info section.