[Site] Add GitHub admonition Commonmark extension

Author: kbond

ux.symfony.com/assets/styles/components/_Changelog.scss

@@ -19,6 +19,12 @@
   border-right: 1px solid var(--bs-secondary-bg);
 }
 
+.Changelog blockquote {
+  color: grey;
+  border-left: grey 3px solid;
+  padding-left: .75rem;
+}
+
 .ChangelogItem {
   display: grid;
   gap: 4rem;

ux.symfony.com/composer.json

@@ -65,7 +65,8 @@
         "twig/intl-extra": "^3.17",
         "twig/markdown-extra": "^3.17",
         "twig/string-extra": "^3.17",
-        "twig/twig": "^3.17"
+        "twig/twig": "^3.17",
+        "zenstruck/commonmark-extensions": "1.x-dev"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.6.21",

ux.symfony.com/composer.lock

@@ -19,6 +19,7 @@
 use League\CommonMark\Extension\FrontMatter\FrontMatterExtension;
 use League\CommonMark\Extension\Mention\MentionExtension;
 use Symfony\Component\DependencyInjection\Attribute\AsDecorator;
+use Zenstruck\CommonMark\Extension\GitHub\AdmonitionExtension;
 
 /**
  * @author Kevin Bond <[email protected]>
@@ -55,6 +56,7 @@ public function __invoke(): CommonMarkConverter
             ->addExtension(new ExternalLinkExtension())
             ->addExtension(new MentionExtension())
             ->addExtension(new FrontMatterExtension())
+            ->addExtension(new AdmonitionExtension())
             ->addRenderer(FencedCode::class, new CodeBlockRenderer($this->toolkitService))
         ;