docs(readme): add english navigation links to localized readmes

add secondary english navigation links in smaller font to all localized readme files for better accessibility
fix incorrect internal links in english documentation

docs-readme/vi-VN/README.md

@@ -23,7 +23,12 @@
 <p align="center">
   <a href="https://datawhalechina.github.io/easy-vibe/welcome.html">Đọc trực tuyến</a> ·
   <a href="#-điều-hướng">Bản đồ học tập</a> ·
-  <a href="#contact">Cộng đồng</a>
+  <a href="#contact">Cộng đồng</a><br>
+  <span style="font-size: 0.85em; color: #888;">
+    <a href="https://datawhalechina.github.io/easy-vibe/welcome.html">Read Online</a> ·
+    <a href="#-navigation">Learning Map</a> ·
+    <a href="#contact">Community</a>
+  </span>
 </p>
 
 <p align="center">