Add CI workflows, documentation, and PDF generation scripts

[rafageist]

This pull request introduces a comprehensive set of improvements to project infrastructure, documentation, and release automation for Div PHP Ways. The most significant changes include adding project-specific CI workflows, improving and restructuring documentation, and establishing a robust release process with automated PDF documentation and release note requirements.

Continuous Integration and Quality Assurance:

• Added GitHub Actions workflows for running PHPUnit tests (.github/workflows/tests.yml), static analysis with PHPStan (.github/workflows/phpstan.yml), and automated release builds with PDF documentation and artifact uploads (.github/workflows/release.yml). [1] [2] [3]
• Introduced a PHPStan configuration file (phpstan.neon) and a PHPUnit configuration file (phpunit.xml) tailored to the project. [1] [2]

Documentation Improvements:

• Major rewrite and simplification of README.md to clarify the "ways" concept, provide concise usage examples, and document installation, rules, CLI usage, and license.
• Added and reordered documentation files for book/PDF generation, including a new book order file (docs/book-order.txt) and improved navigation in the Markdown docs. [1] [2]
• Added a stylized HTML back page for the generated documentation PDF (scripts/back.html).

Release Process Automation:

• Established a release notes policy and template in releases/README.md, requiring a Markdown file per release and providing a script for generating drafts.
• Added an initial release notes file for v2.5.0 (releases/v2.5.0.md).
• Updated .gitattributes to exclude development and CI files from release archives.

Grouped summary of the most important changes:

1. CI/CD and Quality Automation

• Added GitHub Actions workflows for PHPUnit testing, PHPStan static analysis, and automated release builds with PDF documentation and artifact uploads. (.github/workflows/tests.yml, .github/workflows/phpstan.yml, .github/workflows/release.yml) [1] [2] [3]
• Added project-specific PHPStan and PHPUnit configuration files for static analysis and test execution. (phpstan.neon, phpunit.xml) [1] [2]

2. Documentation Overhaul

• Rewrote and reorganized README.md for clarity, concise examples, and improved onboarding.
• Improved documentation structure and navigation with a new book order file and updated Markdown references. (docs/book-order.txt, docs/Div PHP Ways.md) [1] [2]
• Added a custom HTML back page for the generated documentation PDF. (scripts/back.html)

3. Release Management

• Introduced a release notes policy and automation script, requiring Markdown release notes for each version and providing a template. (releases/README.md)
• Added an example release notes file for v2.5.0. (releases/v2.5.0.md)
• Updated .gitattributes to exclude development and CI files from release archives.
• Create release workflow for automated versioning and artifact uploads
• Add tests workflow for PHPUnit integration
• Introduce book order file for documentation structure
• Configure PHPStan for static analysis
• Set up PHPUnit configuration file
• Add release notes template and initial release note for v2.5.0
• Implement HTML templates for cover and back pages of the documentation
• Develop PDF building script with support for Mermaid diagrams
• Generate release notes script to automate release documentation
• Add Puppeteer configuration for HTML to PDF rendering
• Implement unit tests for the Ways routing engine
• Create bootstrap file for test environment setup