Update _navbar.md

Author: Mine77

docs/zh-CN/_navbar.md

@@ -1,5 +1,5 @@
 <!-- the following part should be indentical to https://raw.githubusercontent.com/cryptape/Nervos-Docs/master/_navbar.md -->
-* [Nervos](https://cryptape.github.io/Nervos-Docs)
+* [Nervos](http://docs.nervos.org)
   * [AppChain](https://cryptape.github.io/Nervos-AppChain-Docs/)
   * [CITA](https://cryptape.github.io/cita/)
   * [Neuron](https://cryptape.github.io/Neuron-Android/#/)