chore: remove node-sass (#605)

docs/admin/customizing-css.mdx

@@ -35,16 +35,6 @@ You can specify your own SCSS variable stylesheet that will allow for the overri
 
 To do so, provide your base Payload config with a path to your own SCSS variable sheet.
 
-**NOTE: Before you start editing your SCSS file, make sure you install 'sass-loader' & 'node-sass' as dev dependencies.**
-**Node**
-```
-npm install sass-loader node-sass --save-dev
-```
-**YARN**
-```
-yarn add sass-loader node-sass --save-dev
-```
-
 **Example in payload.config.js:**
 ```js
 import { buildConfig } from 'payload/config';