Fix broken url issue

Author: ajay-dhangar

docs/index.mdx

@@ -58,7 +58,7 @@ Select a technology below to dive into our structured tutorials. Each path is de
 
 <DocsCards>
 
-<DocsCard header="HTML" href="/languages-platforms/category/html/" icon="/icons/html-5.svg">
+<DocsCard header="HTML" href="/languages-platforms/html/intro-html" icon="/icons/html-5.svg">
   <p>Learn the building blocks of the web — HTML. Understand tags, attributes, forms, and layout fundamentals to create structured webpages.</p>
 </DocsCard>