added mobile-nav js + styling
fix button styling
Remove search bar from partial
Revert mobile nav design to previous.
Rename the ids in BEM classic syntax
Remove search from the mobile nav
Hide the drop down menu when JS is turned off
Reorder the class names for the primary nav
Add in menu items to test the drop down menu JS
Fix the drop down menu links not working by increasing setTimeout
Fix link behaviour on mobile
Merge branch 'feature/primary-nav-advanced'