Make the Header Banner Having Contrast

[justankiit]

The Current Header Banner is of color Grey , Make it to Black to look better Contrasted.

[Arshdeep-13]

hello @kumarankit999
I have solved your issue you can refer to my pull request:-
link 1:- gh pr checkout 23
link 2:- https://github.com/mmacneil/devfolio/pull/23

One more thing if you like my changes then please follow me😅😇😇.

Thanks
@Arshdeep-13