Revert "reverting back to flexnav"

This reverts commit e57520e346f8b8f10476005df9eebf99dfdbd1e0.
reverting back to flexnav (reverted from commit e57520e346f8b8f10476005df9eebf99dfdbd1e0)
removing meanmenu remnants
added customizer elements for mobile nav label and min-width values
compiled style updates
updating menu transitions