Revert "Merge pull request #804 from owid/move-subnav"
Revert "Merge pull request #804 from owid/move-subnav"

This reverts commit f67ea72c63e35ba6dc47bea28f6e238b21a95f16, reversing
changes made to 384846f4d893be5d6b849148425841170a370c1b.

OurWorldInData/owid-grapher,OurWorldInData/owid-grapher,owid/owid-grapher,owid/owid-grapher,OurWorldInData/owid-grapher,owid/owid-grapher,owid/owid-grapher,owid/owid-grapher,OurWorldInData/owid-grapher,OurWorldInData/owid-grapher