Revert "Revert "Add nav markup""

This reverts commit 5e5d1372553416f39b072b788372a3dd6b5fae62.
Revert "Revert "Work on the nav""

This reverts commit d6418f7a09c35efdebb86a5cb4a2fe2c25d839e6.
Design: Update close x
Update grid, nav and design
Move design to extra branch
Update images to new design
Update styles to new layout
Update styles
Work on navigation
Finish responsive navigation