✨ Adds a blog

:arrow_up: Upgrade Ruby setup actions and add redcarpet gem Update Ruby setup actions to version 1.285.0 and add redcarpet for Markdown rendering in the blog. :white_check_mark: Add tests for BlogPost and BlogPostRelation Introduce comprehensive tests for BlogPost and BlogPostRelation models to ensure proper functionality and validation. :fire: Remove outdated comparison URLs from sitemap Eliminate links to deprecated comparison pages to streamline sitemap content.