#25789 Gap & BR Top Header Update 2

- Update gap header as request of the brand
- Assigned css property position fixed on main navigation and position under the sale banner
- Change the main navigation banner background color as transparent
- Add animation that will change main navigation background color to white when hover
- Add javascript function that will detect user when scrolling
- Remove main navigation css position fixed property when the user scrollY position is greater than the height of salebanner, unservalbanner and brandbar and limit the event to scrolldown only
- Add javascript that will detect user when scrolling up and show main navigation