Remove className="..." from Header.jsx

[humphd]

In src/frontend/src/components/Header/Header.jsx, we're using unnecessary className attributes. They can be removed:

 {matches ? <MobileHeader className="mobile-header" /> : <DesktopHeader className="header" />}

[pyvelkov]

Hey,
I'm willing to give this a shot. Can I take a crack at this?

[c3ho]

Yep, go ahead! I’ll assign this to you as soon as I find out how to do it on mobile

[PedroFonsecaDEV]

Can I give a try?

[manekenpix]

@PedroFonsecaDEV yes, thank you!