docs: update introduction page

Author: codeacme17

docs/en/guide/introduction.md

@@ -4,10 +4,6 @@
 
 Echo UI is currently in the development stage of its core features. We warmly welcome partners interested in this type of component library to join us. We also appreciate any valuable suggestions submitted through [issue](https://github.com/codeacme17/echo-ui/issues)
 
-Once the core functionality is developed, it will be available on NPM, and then Echo UI can be installed using tools like `npm`.
-
-For more development plans, check out [Roadmap](https://github.com/codeacme17/echo-ui/blob/main/ROADMAP.md).
-
 :::
 
 ## Why Echo UI?

docs/zh/guide/introduction.md

@@ -4,10 +4,6 @@
 
 Echo UI 当前处于核心功能的开发阶段，十分欢迎对该类型组件库该兴趣的伙伴加入，也很欢迎在 [issue](https://github.com/codeacme17/echo-ui/issues) 提出宝贵的意见
 
-当核心功能开发完成后，将会上架 NPM，届时可以通过 `npm` 等工具安装 Echo UI
-
-更多开发计划可以查看 [Roadmap](https://github.com/codeacme17/echo-ui/blob/main/ROADMAP.md)
-
 :::
 
 ## 为什么使用 Echo UI？