调整 sass.md标题

Author: dcloud-wandl

en/Tutorial/extension/sass.md

@@ -1,25 +1,25 @@
-### Sass
+# Sass
 
 Sass is a CSS extension that allows you to use variables , nested rules , mixins , inline imports and other functions based on CSS syntax to make CSS more powerful and elegant.. 
 
 Using Sass and the Compass style library can help better organize and manage style files and develop projects more efficiently.
 
 [sass docs](http://en.sass.hk/docs/)
 
-### Install
+## Install
 
 In HBuilderX, the use of `scss/sass` requires the installation of the `compile-node-sass compilation plugin`.
 
 [compile-node-sass Download](https://ext.dcloud.net.cn/plugin?id=2046)
 
-### usage
+## usage
 
 - The uni-app project will automatically compile files that use sass。
 - Compile the sass file separately. Select the sass file, click the right-click menu -> external command -> sass -> compile scss/sass.
 
 <img src="/static/snapshots/tutorial/menu_tool/project-explorer_menu_en.png"  class="hd-img"/>
 
-### Configuration file
+## Configuration file
 
 The configuration file of compile-node-sass is package.json.
 
@@ -67,15 +67,16 @@ Click the menu [Tools -> External Command Setting -> compile-node-sass -> packag
 }
 
 ```
-### shortcut keys
+
+## shortcut keys
 
 Click the menu [Tools -> External Command Setting -> compile-node-sass -> package.json] to open the package.json file.
 
 Open package.json and modify the key value to configure the shortcut key; this external command can be run directly through this shortcut key.
 
 For example: `"key": "ctrl + alt + C"`
 
-### Save and compile now
+## Save and compile now
 
 Click the menu [Tools -> External Command Setting -> compile-node-sass -> package.json] to open the package.json file.