docs: refresh English and Japanese README for globalization

Assisted-by: Claude (AWS Bedrock anthropic.claude-3-haiku-20240307-v1:0)
Assisted-by: GitHub Copilot (GPT-5.3-Codex)

Author: amilkh

README.ja.md

@@ -37,5 +37,5 @@ mail: code4fukui (＠gmail.com)
 
 ## 制作
 
-- [Code for FUKUI](../)
+- [Code for FUKUI](..)
 - [src on GitHub](https://github.com/code4fukui/code4fukui.github.io/blob/master/digitaltwin/index.md)

README.md

@@ -6,7 +6,7 @@ The Digital Twin Echizen project aims to create a digital twin of the city of Ec
 
 ## Related Projects
 
-- [VR Fukui](https://code4fukui.github.io/vr-fukui/)
+- [VR FUKUI](https://code4fukui.github.io/vr-fukui/)
 - [glb-viewer](https://code4fukui.github.io/glb-viewer/)
 - [VR Map](https://github.com/code4fukui/vrmap/)
 - [VR River](https://code4fukui.github.io/vr-river/)
@@ -40,4 +40,6 @@ Email: code4fukui (at) gmail.com
 ## Production
 
 - [Code for FUKUI](https://code4fukui.github.io)
-- [Source on GitHub](https://github.com/code4fukui/code4fukui.github.io/blob/master/digitaltwin/index.md)
+- [Source on GitHub](https://github.com/code4fukui/code4fukui.github.io/blob/master/digitaltwin/index.md)
+
+MIT License — see [LICENSE](LICENSE).