Add blog.sh to site generators

[DanielSnor]

Adds blog.sh to src/site/generators.

It is a Ruby static site generator for blogs that uses only the standard library -- no gems and no npm. Posts are JSON files of typed blocks, the site is a static build, and comments are Fediverse replies to each post's announcement, fetched client-side from the public API.

• Source: https://github.com/DanielSnor/blog.sh (MIT, v1.0)
• Site, which runs on the engine: https://blogsh.app

The entry follows the same frontmatter shape as the existing Ruby generators (title, repo, homepage, language, license, templates, description).

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[matbrgz]

The frontmatter matches the other Ruby generators and parses cleanly. The repo is live, MIT-licensed and actively pushed, and ERB templates are confirmed by the README (templates/). blog.sh isn't on main and no other open PR adds it.

Small suggestion: the body is mostly about importers and deploy backends. One sentence on the build itself (JSON posts → ERB → static HTML, RSS/sitemap) near the top would make it clearer to readers browsing for an SSG.

[DanielSnor]

Thanks for the review. Fair point -- I added a sentence on the build itself to the opening paragraph and brought the importer count up to date (the project has grown since August).