Add Day/Night (Light/Dark Mode) Toggle in Navbar

[stutitiwari23]

Is your feature request related to a problem or challenge?

To improve accessibility and user experience, we want to add a Day/Night (Light/Dark Mode) toggle to the navigation bar. The toggle should allow users to switch between light and dark themes seamlessly.

Describe the solution you'd like

-The toggle should be placed in the navbar
-Positioned to the left of the language/translation (EN) button
-Must align visually with existing navbar elements

Describe alternatives you've considered

-Clicking the toggle switches between Light Mode and Dark Mode
-The selected theme should:

1. Apply across the entire website
2. Persist across page reloads (using localStorage or equivalent)
   -Default theme can be:
3. System preference (prefers-color-scheme), or
4. Light mode (developer’s choice)

Additional context

@DYHARDx Please assign this to me.

[github-actions]

Thank you for raising this issue!

We'll review it as soon as possible. We truly appreciate your contributions! ✨

Meanwhile make sure you've visited the README.md, CONTRIBUTING.md, and CODE_OF_CONDUCT.md before creating a PR for this. Also, please do NOT create a PR until this issue has been assigned to you. 😊