Replace README with comprehensive site-focused documentation

[Copilot]

This PR completely replaces the existing README with a comprehensive, user-friendly documentation that focuses specifically on the EMDR.dev site and its functionalities, addressing the issue requirements.

What Changed

The new README transforms from a basic technical overview to an engaging, comprehensive guide that includes:

• 🚀 Overview: Detailed description of EMDR.dev as a development playground, its goals, and the problems it solves
• ✨ Features: Comprehensive breakdown of core functionality, development features, and user experience elements
• 🛠 Getting Started: Clear prerequisites, installation steps, and available scripts
• 📖 Usage: Practical guidance for exploring the site, developer workflows, and customization options
• 🤝 Contributing: Detailed contribution guidelines and development setup for contributors
• 📞 Contact Information: Multiple ways for users to get support and connect with the project

Key Improvements

1. Removed all DNS references as requested - the README now focuses entirely on the site itself
2. Added engaging content based on the actual site functionality from app/page.tsx
3. Structured with clear sections using emojis and proper markdown formatting
4. Emphasized the "fun-first" philosophy that's central to the site's identity
5. Included practical guidance for both users and potential contributors
6. Enhanced readability with proper formatting, code blocks, and clear navigation

Technical Details

The content is derived directly from the site's actual features as implemented in the codebase:

• Interactive terminal component
• Modern Next.js 15 + React 19 stack
• Tailwind CSS + Radix UI design system
• Rapid prototyping capabilities
• Safe experimentation environment

The documentation maintains technical accuracy while being accessible to developers of all experience levels.

This pull request was created as a result of the following prompt from Copilot chat.

The existing README file in the "AddFuture" repository may not adequately describe the site's purpose, features, and usage instructions. Replace the current README with a new one that provides detailed information specifically about the site and its functionalities. The new README should include:

1. Overview: A brief description of the site, its goals, and the problems it solves.
2. Features: Highlight key features of the site.
3. Getting Started: Instructions on how users can get started with the site, including prerequisites and setup steps if necessary.
4. Usage: Basic usage instructions to help users navigate and utilize the site's features.
5. Contributing: Guidelines for contributing to the site.
6. Contact Information: How users can reach out for support or questions about the site.

Ensure the README is clear, engaging, and user-friendly. Avoid references to DNS, as this README should focus on the site itself.

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