docs: update for disabling navbar via front matter (#232)

Author: ulivz

docs/default-theme-config/README.md

@@ -35,7 +35,7 @@ If you want to use a completely custom homepage layout, you can also use a [Cust
 
 ## Navbar
 
-The Navbar may contain your page title, [Search Box](#search-box), [Navbar Links](#navbar-links), [Languages](/guide/i18n.html#internationalization) and [Repository link](/default-theme-config/#git-repo-and-edit-links) - all of them depends on your configuration.
+The Navbar may contain yourg  page title, [Search Box](#search-box), [Navbar Links](#navbar-links), [Languages](../guide/i18n.md) and [Repository Link](#git-repo-and-edit-links), all of them depends on your configuration.
 
 ### Navbar Links
 

docs/zh/default-theme-config/README.md

@@ -33,7 +33,11 @@ footer: MIT Licensed | Copyright © 2018-present Evan You
 
 ## 导航栏
 
-你可以通过 `themeConfig.nav` 增加一些导航链接:
+导航栏可能包含你的页面标题、[搜索框](#搜索框)、 [导航栏链接](#导航栏链接)、[多语言切换](../guide/i18n.md)、[仓库链接](#git-仓库和编辑链接)，它们均取决于你的配置。
+
+### 导航栏链接
+
+你可以通过 `themeConfig.nav` 增加一些导航栏链接:
 
 ``` js
 // .vuepress/config.js
@@ -84,6 +88,16 @@ module.exports = {
 }
 ```
 
+### 禁用导航栏
+
+你可以通过 `YAML front matter` 来禁用掉某个指定页面的导航栏：
+
+``` yaml
+---
+navbar: false
+---
+```
+
 ## 侧边栏
 
 想要使 侧边栏（Sidebar）生效，需要配置 `themeConfig.sidebar`，基本的配置，需要一个包含了多个链接的数组：