docs(readme): chage lowercase & path

Author: SARDONYX-sard

docs/i18n/jp/README.md renamed to docs/i18n/jp/readme.md

@@ -1,6 +1,6 @@
 # Docker + WSLg GUI-Template
 
-[English](../../../README.md) | 日本語
+[English](https://github.com/SARDONYX-sard/docker-wslg-gui-template#vs-code-user) | 日本語
 
 ## 概要
 

README.md renamed to readme.md

@@ -1,6 +1,6 @@
 # Docker + WSLg GUI-Template
 
-English | [日本語](./docs/i18n/jp/readme.md)
+English | [日本語](./docs/i18n/jp/README.md)
 
 ## About