Update link for openapi-format (#698)

Author: thim81

src/components/ExternalArticle.tsx

@@ -56,7 +56,7 @@ const ExternalArticle: React.FC<FeaturedArticle> = (props) => {
           <h3 className="mt-3 text-lg leading-6 font-semibold text-gray-900 group-hover:text-gray-600">
             <Link
               href={url}
-              className="font-medium no-underline absolute inset-0"
+              className="absolute inset-0 font-medium no-underline"
               toolSlug={toolSlug}
               linkType="featured_article"
               linkPlacementDescription="featured-article-card"

src/content/tools/openapi-format.md

@@ -6,7 +6,7 @@ categories:
   - misc
   - parsers
   - converters
-link: https://openapi-format-playground.vercel.app
+link: https://openapi-format.com
 languages:
   nodejs: true
   cli: true
@@ -49,6 +49,6 @@ featuredArticles:
 - **Generate elements**: Auto-generate `operationIds` using customizable templates based on method, path, and tags.
 - **Bundle and split**: Resolve all `$ref` references into a single file, or split large documents into modular multi-file structures for easier management.
 - **Strip unused components**: Automatically detect and remove schemas, parameters, examples, and other components that are no longer referenced.
-- **Online playground**: Experiment with formatting options interactively at https://openapi-format-playground.vercel.app.
+- **Online playground**: Experiment with formatting options interactively at https://playground.openapi-format.com.
 
 Built to simplify maintaining OpenAPI documents and keep specifications clean, consistent, and automation-ready.