Add four new static site generator templates: WordPress Gatsby, Minimalist Portfolio, Minimal Gallery, Multiple Page Portfolio

[tomcomtang]

This pull request adds four new static site generator templates to the src/site/generators/ directory:

• WordPress Gatsby: A personal blog template integrating WordPress as a headless CMS with Gatsby, supporting both remote WordPress content and local config file modes.
• Minimalist Portfolio: A clean, modern, and responsive portfolio template for developers and creatives, built with React, HTML, and CSS.
• Minimal Gallery: A lightweight, fast, and easy-to-use static image gallery template for quickly showcasing photos or artwork with a minimalist design.
• Multiple Page Portfolio: A multi-page portfolio template for developers and creatives, featuring separate pages for projects, about, contact, and more, with a modern and responsive design.

Each template includes:

• A detailed .md file with project overview, features, getting started instructions, use cases, and demo links.
• A cover image (thumbnailurl) in the frontmatter, with images placed in src/site/img/cms/.

These additions aim to provide more options for the Jamstack community to quickly launch personal blogs, portfolios, and galleries.

Thank you for reviewing!

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