Clean up and modernize quickstart guide

[josbeir]

Modernize Quick Start Guide

Updates the Quick Start Guide with modern VitePress features, PHP strict typing, and improved structure.

Key Changes

• Added introduction section - Overview, learning objectives, prerequisites, and next steps
• VitePress code groups - OS-specific commands (Linux/macOS vs Windows), SQL options (MySQL/PostgreSQL)
• Modern callouts - Replaced blockquotes with proper ::: tip, ::: info, ::: warning syntax
• PHP strict typing - Added declare(strict_types=1); and return type hints to all examples
• Migrations first - Prioritized migrations over raw SQL with complete workflow and seed examples
• Better highlighting - Line highlights focus on meaningful changes (strict types, return types) not random lines

Benefits

• Demonstrates PHP 8.2+ best practices
• Better UX with modern documentation features
• More beginner-friendly structure with clear next steps

[Copilot]

Pull request overview

This PR modernizes the CakePHP Quick Start Guide with contemporary documentation features and PHP 8.2+ best practices, making it more beginner-friendly and professionally structured.

Changes:

• Enhanced quickstart guide with clear learning objectives, prerequisites table, and structured "What's Next" section
• Migrated from legacy blockquotes to modern VitePress callouts (::: tip, ::: info, ::: warning)
• Added OS-specific code groups for installation commands and SQL dialect options
• Implemented PHP strict typing (declare(strict_types=1)) and return type hints across all code examples
• Reorganized table of contents to prioritize quickstart before installation
• Emphasized migrations-first approach with complete workflow examples including seeds

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
toc_en.json	Reordered navigation to place Quickstart before Installation and removed trailing whitespace
docs/en/tutorials-and-examples/cms/installation.md	Added VitePress code groups for OS-specific commands, modernized callouts, and improved directory structure formatting
docs/en/tutorials-and-examples/cms/database.md	Restructured to prioritize migrations over raw SQL, added comprehensive seed examples, and improved organization with modern callouts
docs/en/tutorials-and-examples/cms/articles-model.md	Added PHP strict typing declarations and return type hints with appropriate line highlighting
docs/en/tutorials-and-examples/cms/articles-controller.md	Enhanced with strict typing, return type hints, modern callouts, and XSS security tips
docs/en/quickstart.md	Added comprehensive introduction section with learning objectives, prerequisites table, feature checklist, and detailed "What's Next" resources

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