fix(home): center hero inner container with margin: 0 auto

Co-Authored-By: Claude <noreply@anthropic.com>

Author: yyyCode

vue/src/assets/blog.css

@@ -397,6 +397,7 @@ body {
 
 .home-hero-inner {
   max-width: 720px;
+  margin: 0 auto;
   text-align: center;
 }