docs(markdown): update markdown config

Author: QingWei-Li

docs/configuration.md

@@ -111,7 +111,7 @@ Add TOC in custom sidebar.
 
 ```js
 window.$docsify = {
-  subMaxLevel: 3
+  subMaxLevel: 2
 }
 ```
 
@@ -219,6 +219,17 @@ See [Markdown configuration](/markdown).
 
 ```js
 window.$docsify = {
+  // object
+  markdown: {
+    smartypants: true,
+    renderer: {
+      link: function() {
+        // ...
+      }
+    }
+  },
+
+  // function
   markdown: function (marked, renderer) {
     // ...
     return marked

docs/markdown.md

@@ -1,12 +1,16 @@
 # Markdown configuration
 
-The Markdown parser is [marked](https://github.com/chjj/marked). You can customize how docsify renders your Markdown content to HTML.
+The Markdown parser is [marked](https://github.com/chjj/marked). You can customize how docsify renders your Markdown content to HTML. Support customize `renderer`.
 
 ```js
 window.$docsify = {
   markdown: {
-    smartypants: true
-    // ...
+    smartypants: true,
+    renderer: {
+      link: function() {
+        // ...
+      }
+    }
   }
 }
 ```

docs/zh-cn/configuration.md

@@ -113,7 +113,7 @@ window.$docsify = {
 
 ```js
 window.$docsify = {
-  subMaxLevel: 3
+  subMaxLevel: 2
 }
 ```
 
@@ -212,12 +212,23 @@ window.$docsify = {
 
 ## markdown
 
-- 类型: `Function`
+- 类型: `Object|Function`
 
 参考 [Markdown 配置](/zh-cn/markdown)。
 
 ```js
 window.$docsify = {
+  // object
+  markdown: {
+    smartypants: true,
+    renderer: {
+      link: function() {
+        // ...
+      }
+    }
+  },
+
+  // function
   markdown: function (marked, renderer) {
     // ...
     return marked

docs/zh-cn/markdown.md

@@ -1,12 +1,16 @@
 # Markdown 配置
 
-内置的 Markdown 解析器是 [marked](https://github.com/chjj/marked)，可以修改它的配置。
+内置的 Markdown 解析器是 [marked](https://github.com/chjj/marked)，可以修改它的配置。同时可以直接配置 `renderer`。
 
 ```js
 window.$docsify = {
   markdown: {
-    smartypants: true
-    // ...
+    smartypants: true,
+    renderer: {
+      link: function() {
+        // ...
+      }
+    }
   }
 }
 ```

docs/zh-cn/quickstart.md

@@ -1,3 +1,4 @@
+# 快速开始
 
 推荐安装 `docsify-cli` 工具，可以方便创建及本地预览文档网站。