Remove old header CSS
Remove old header CSS

OurWorldInData/owid-grapher,OurWorldInData/owid-grapher,OurWorldInData/owid-grapher,owid/owid-grapher,owid/owid-grapher,OurWorldInData/our-world-in-data-grapher,owid/owid-grapher,OurWorldInData/our-world-in-data-grapher,owid/owid-grapher,OurWorldInData/our-world-in-data-grapher,owid/owid-grapher,OurWorldInData/owid-grapher,OurWorldInData/our-world-in-data-grapher,OurWorldInData/owid-grapher