Added light and dark mode

[sanglaphalder]

Pull Request

Title and Issue Number (mandatory)

Title : Added light and dark mode

Issue No. : #38

Close #38

Description (30-50 words)

I have added light and dark mode functionality in the website

Screenshot (mandatory)

Files Changed (mandatory)

• App.js
• header.js
• index.css

Checklist: (mandatory)

• [x ] I have mentioned the issue number in my Pull Request.
• [ x] I have added a screenshot as a proof of my work.

Additional context

Are you contributing under any Open-source programme? I am contributing under JWoC 204

[sanglaphalder]

Please add the JWoC label and difficulty label

[nepalivai]

hey, @Sanglap-Halder @Ritwika-14, Can you check the netilify sute there seems to be some issue the changes are not applied.