Add announcement for Ruby's new documentation theme

en/news/_posts/2025-12-23-new-look-for-ruby-documentation.md

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+---
+layout: news_post
+title: "A New Look for Ruby's Documentation"
+author: "Stan Lo"
+translator:
+date: 2025-12-23 00:00:00 +0000
+lang: en
+---
+
+Following the [ruby-lang.org redesign](https://www.ruby-lang.org/en/news/2025/12/22/redesign-site-identity/), we have more news to celebrate Ruby's 30th anniversary: [docs.ruby-lang.org][ruby-doc] has a completely new look with Aliki—[RDoc](https://github.com/ruby/rdoc)'s new default theme.
+
+## A Fresh Look for Ruby Documentation
+
+Ruby has always been a joy to write, and now reading Ruby documentation can match that experience. Aliki brings a modern, clean design to [docs.ruby-lang.org][ruby-doc] and any gem that generates documentation with RDoc v7.0+.
+
+## Key Features
+
+- **Improved search**: Case-aware ranking, fuzzy matching, and support for searching constants
+- **Dark mode**: Respects your OS preference with a manual toggle
+- **Three-column layout**: Left sidebar for navigation, center for content, right sidebar for table of contents
+- **Code block improvements**: Copy buttons on code blocks and C syntax highlighting
+- **Customizable footer**: Gem maintainers can add links to their repository, issue tracker, and other resources
+
+## For Gem Authors
+
+If you generate documentation with RDoc 7.0+, your users will see Aliki automatically. You can customize footer links or switch back to the Darkfish theme in your `.rdoc_options` file.
+
+## Try It Out
+
+See the new look in action at [docs.ruby-lang.org][ruby-doc].
+
+If you find issues or have suggestions, please [open an issue](https://github.com/ruby/rdoc/issues) on GitHub.
+
+[ruby-doc]: https://docs.ruby-lang.org/en/master/