Update index.html

Author: thinh-vu

index.html

@@ -147,8 +147,8 @@
 
 <!-- Add a panorama banner here -->
 <div style="width: 100%; overflow: hidden; position: relative;">
-  <a href="https://vnstocks.com/docs/tai-lieu/migration-chuyen-doi-sang-vnstock3" style="display: block; width: 100%; height: 100%;">
-      <img src="https://vnstocks.com/assets/images/vnstock3-xin-chao-banner.png" alt="Chuyển sang Vnstock3" style="width: 100%; height: 100%; object-fit: cover;">
+  <a href="https://vnstocks.com/docs/tai-lieu/migration-chuyen-doi-sang-vnstock3?utm_source=vnstock-legacy&utm_medium=announcement_bar" style="display: block; width: 100%; height: 100%;">
+      <img src="https://github.com/thinh-vu/vnstock/blob/legacy/docs/docs/assets/images/vnstock3-migration-notice.png?raw=true" alt="Vnstock3 Xin chào!" style="width: 100%; height: 100%; object-fit: cover;">
   </a>
 </div>