feat: Light mode

[Bashamega]

What feature?

Hello:)
My idea is to add a light mode theme for the site.
And add the toggle light mode button.
Some users who prefer light mode will benefit from it

Add screenshots

None

Record

• I have checked the existing issues
• I have read the Contributing Guidelines
• I agree to follow this project's Code of Conduct
• I want to work on this issue

[github-actions]

To reduce notifications, issues are locked. Your issue will be unlock when we will add label as 🏁 status: ready for dev. Check out the contributing guide for more information.

[priyankarpal]

The project's theme is designed for the black mode :)