Update documentation and generics

[mario-deluna]

This pull request sets up VitePress-based documentation for the project, including a custom syntax highlighter and PHPDoc integration, and updates all documentation links to the new GitHub Pages site. The most important changes are grouped below:

Documentation Site Setup:

• Adds a new GitHub Actions workflow (.github/workflows/docs.yml) to build and deploy documentation to GitHub Pages on every push to master.
• Introduces a VitePress configuration (docs/.vitepress/config.js) with a custom theme, sidebar, and navigation tailored for the project, and sets the base path for GitHub Pages.

Syntax Highlighting and PHPDoc Integration:

• Adds a committed TextMate grammar (docs/.vitepress/ctn.tmLanguage.js) for .ctn files, ensuring consistent syntax highlighting in both the docs and VSCode extension.
• Implements a custom VitePress markdown-it plugin (docs/.vitepress/phpdoc.js) to parse [~ PHPDoc](/src/File.php#method) directives and render tabbed method documentation blocks by extracting PHP signatures and docblocks at build time.

Documentation Link Updates:

• Updates all links in README.md to point to the new GitHub Pages documentation at https://clancats.github.io/Container/ instead of the old clancats.io site, and fixes minor formatting issues. [1] [2] [3] [4]