Create examples demonstrating different theme configurations

[mayank1513]

We need examples demonstrating various approaches to implement multiple themes.

Current examples show following:

• Support for multiple themes
• Support for dark/light mode

Required examples:

• Demonstrating themes with dark/light variants:
  • This can be achieved in two ways:
    1. Using setThemeSet to set darkTheme and lightTheme.
    2. Using a combination of data-color-scheme and data-th.
• Tailwind example
• MUI and StyledComponent examples

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[mayank1513]

See - https://nextjs-themes-ultra.vercel.app/