[Docs] Updating run cli demos

[fellyph]

Motivation for the change, related issues

Updating the runCLI demos to show other ways of working with the method, applying for tests. Including more examples of the new flags. The change also included a description to improve the page SEO and apply some recommendations of the WordPress Docs handbook.

New demos:

• Setting a custom site URL
• Multiple mounts
• Symlink support for monorepos
• Testing plugins with specific PHP versions
• Mode selection (Blueprint v2)
• Skip WordPress and SQLite setup
• Error handling
• Following symlinks programmatically

Portuguese and Spanish versions are also included.