migration notice updated

Author: thinh-vu

docs/docs/assets/images/vnstock3-migration-notice.png

@@ -2,7 +2,7 @@
 <!-- Add a panorama banner here -->
 <div style="width: 100%; overflow: hidden; position: relative;">
   <a href="https://docs.vnstock.site/changes_log/#23-1-2024" style="display: block; width: 100%; height: 100%;">
-      <img src="https://docs.vnstock.site/assets/images/vnstock-v2.0.8.8.png?raw=true" alt="Thông báo quan trọng" style="width: 100%; height: 100%; object-fit: cover;">
+      <img src="https://docs.vnstock.site/assets/images/vnstock3-migration-notice.png?raw=true" alt="Thông báo quan trọng" style="width: 100%; height: 100%; object-fit: cover;">
   </a>
 </div>
 {% endblock %}

docs/docs/material/overrides/announcement.html

@@ -4,7 +4,7 @@ site_description: >-
   Vnstock Docs
 theme:
   name: material
-  # custom_dir: docs/material/overrides
+  custom_dir: docs/material/overrides
   icon:
     repo: fontawesome/brands/github
   logo: assets/images/vnstock_logo_bw.png