add link to kt virtual environment

docs/en-us/navbar.md

@@ -1,6 +1,9 @@
 * [Home](/en-us/)
 * [Feedback And Issue](https://github.com/alibaba/kt-connect/issues)
 * [Downloads](/en-us/downloads)
+* KtCollections
+  * KtConnect (Current)
+  * [KtVirtualEnvironment](https://alibaba.github.io/virtual-environment/#/en-us/)
 * Languages
-  * [En](/en-us/)
+  * English
   * [中文](/zh-cn/)

docs/zh-cn/navbar.md

@@ -1,6 +1,9 @@
 * [首页](/zh-cn/)
 * [问题和反馈](https://github.com/alibaba/kt-connect/issues)
 * [下载](/zh-cn/downloads)
+* Kt系列工具
+  * KtConnect (当前项目)
+  * [KtVirtualEnvironment](https://alibaba.github.io/virtual-environment/#/zh-cn/)
 * 语言
-  * [En](/en-us/)
-  * [中文](/zh-cn/)
+  * [English](/en-us/)
+  * 中文