feat: update font styles and related articles layout - Update font-family and font-weight properties in `lb-related-articles-block.css` and `lb-related-articles-node.css` - Refactor SCSS files to use variables for font-families - Add hook_install function in `lb_related_articles_blocks.install` to create and append a new block content - Update library versions in `lb_related_articles_blocks.libraries.yml`