Reduce spacing between article subtitle and main content

Adjusted margin-top for article content div in Article.tsx to -mt-8.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 0fb68265-c270-4198-9584-3d9be9bddb41
Replit-Commit-Checkpoint-Type: full_checkpoint

client/src/pages/Article.tsx

@@ -192,7 +192,7 @@ export default function Article() {
           </header>
 
           <div 
-            className="text-base text-gray-800"
+            className="text-base text-gray-800 -mt-8"
             data-testid="text-article-content"
           >
             {parseArticleContent(article.content).map((part, index) => {