Copilot: Improve docs for newcomers

[Copilot]

The README lacked clear onboarding paths and was difficult for newcomers to navigate.

Changes

Structure & Content

• Added project introduction ("What is Apitte Skeleton?") with key features and use cases
• Listed prerequisites upfront (PHP 8.2+, Composer, Docker/database options)
• Reorganized installation into three progressive paths: Docker Compose (beginner), manual with Docker DB, full manual
• Added "Next Steps" section with actionable guidance for first endpoint, migrations, and domain creation

Documentation Quality

• Categorized API endpoints by access level (public/protected) with authentication examples
• Added project structure visualization with purpose annotations
• Consolidated make commands into quick reference by category (dev, quality, database)
• Added troubleshooting section covering port conflicts, database issues, permissions, cache

Organization

• Used emoji navigation for section scanning
• Eliminated duplicate "Technical Details" and "Screenshots" sections
• Fixed command syntax (docker-adminer → make docker-adminer)
• Grouped Composer packages by domain (core, database, Symfony, dev tools)

Example

Before:

## Goal
Main goal is to provide best prepared API starter-kit project for Nette-Apitte developers.

After:

## What is Apitte Skeleton?

**Apitte Skeleton** is a fully-featured, production-ready starter template for building modern REST APIs with PHP.

Perfect for developers who want to:
- 🚀 Start building APIs quickly without boilerplate setup
- 📚 Learn best practices for PHP API development
- 🏗️ Build production-ready REST/JSON APIs with proper architecture

Original prompt

Suggest better readme description what this project do, how to use it, how get started, etc. Make it friendly for newcomers.

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

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