Feature Request: Improve Footer Design on Day.js Website

### **Current Footer**
The current footer (screenshot attached) has:
- A **dark background** with minimal content.
- Community links like **GitHub**, **Gitter**, and **Sitemap**.
- A small copyright notice.

While functional, it feels **visually sparse and outdated** compared to modern documentation sites.

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### **Goals**

1. Make the footer more visually engaging and informative.
2. Improve content hierarchy and readability.
3. Maintain visual consistency with the rest of the site’s theme.
4. Add responsive design for better mobile display.

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### **Non-Goals**

1. Full redesign of the Day.js branding.
2. Adding unnecessary animations or scripts.
3. Changing navigation structure or page layout.

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### **Background**

Modern open-source documentation sites often use a richer footer design that:
- Includes quick links (Docs, API, GitHub, Blog, License).
- Provides social media or community badges.
- Highlights open-source acknowledgments or contributors.
- Offers a clear copyright and project version.

Examples: [React Docs](https://react.dev/), [Next.js](https://nextjs.org/), [MDN](https://developer.mozilla.org/)

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