add logo image and fix code

fix images and code
fix image
modified images and code
modified images and code
change JP logo to EN logo
add link
Merge branch 'main' into change-users-logo
Merge branch 'main' into change-users-logo

Signed-off-by: kpango <kpango@vdaas.org>

README.md

@@ -237,10 +237,16 @@ Docker images tagging policy:
 ## Vald Users
 
 <p align="center">
-    <img src="./assets/image/vald-users/yahoojapan.svg" alt="yahoojapan" width="30%" />
-&nbsp; &nbsp; &nbsp; &nbsp;
-    <img src="./assets/image/vald-users/japansearch_color.png.webp" alt="jpsearch" />
-  </ul>
+  <a href="https://www.lycorp.co.jp/en/" target="_blank">
+  <picture>
+    <source media="(prefers-color-scheme: dark)" srcset="./assets/image/vald-users/lycorp_white.png">
+    <source media="(prefers-color-scheme: light)" srcset="./assets/image/vald-users/lycorp_black.png">
+    <img alt="LY" src="./assets/image/vald-users/lycorp.png" width="150" height="120">
+  </picture>
+  </a>
+  <a href="https://jpsearch.go.jp/" target="_blank">
+    <img src="./assets/image/vald-users/japansearch_color.png" alt="jpsearch" width="150" height="120"/>
+  </a>
 </p>
 
 ## Contribution