docs: add theme part

packages/docs/docs/.vuepress/config.js

@@ -58,6 +58,10 @@ module.exports = {
             text: 'Plugin',
             link: '/plugin/'
           },
+          {
+            text: 'Theme',
+            link: '/theme/'
+          },
           {
             text: 'Default Theme Config',
             link: '/default-theme-config/'

packages/docs/docs/plugin/README.md

@@ -340,24 +340,9 @@ See: [base](../config/README.md#base).
 
 ## Lifecycle
 
-首先，我们都知道 VuePress 有两个主要指令：
-
-``` bash
-vuepress dev
-vuepress build
-```
-
-dev 和 build 的工作过程大抵相同，他们的基本工作流程如下:
-
 ![image](/plugin.png)
 
-
-
-
-
-
-
-在正式介绍插件之前，我们需要花一些时间来了解 VuePress 的基本工作原理。
+- TODO
 
 
 

packages/docs/docs/theme/README.md

+---
+sidebar: auto
+---
+
+# Themes
+
+## Writing a theme
+
+TODO. integrate with the old docs.
+
+## Theme API
+
+### layout
+
+TODO
+
+### notFound
+
+TODO
+
+### plugins
+
+TODO