feat: dark mode for homepage and documentation

[dipanshurdev]

Feature description

It would be great to have a dark mode option for the website, including the homepage and documentation. This would improve readability and user experience, especially in low-light environments.

Why would it be useful?

Dark mode reduces eye strain, especially in low-light conditions, and is preferred by many users for accessibility and aesthetic reasons. It's also becoming a standard feature in modern websites and developer tools.

Additional context

No