Add dark mode toggle to the first-contributions website

[Alimilla-Abhinandan]

🐞 Problem
The website currently only supports a light theme, which might not be comfortable for users working in low-light environments.

🎯 Goal
Improve user experience and accessibility by adding a dark mode toggle, which is especially useful for contributors spending long hours reading or contributing at night.

💡 Possible solutions
Implement a CSS-based dark mode toggle with local storage support to remember the user's preference.

📋 Steps to solve the problem

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[HarshilChavada04]

Hey, This sounds like a great feature to add! I'm ready to work on it -please assign me.

[MitttapalliAbhishek]

Hey,
I would like to work on this issue, I'm also available to work on any other issues you have.

[shalmalee98]

Hey, seems like a good start to contributing, could you please assign it to me? @Roshanjossey

[aavashrajsigdel]

I’m working on this! Will implement a CSS-based dark mode toggle with localStorage support.

[varuntyagii]

Hi, I would like to work on this issue. Can you please assign it to me?

[Adil-im]

Is anyone working on this issue?