docs(dev-server): add contentBasePublicPath option

Author: Andrew Luca

src/content/configuration/dev-server.md

@@ -279,6 +279,25 @@ webpack-dev-server --content-base /path/to/content/dir
 ```
 
 
+## `devServer.contentBasePublicPath`
+
+`string = '/'`
+
+Tell the server at what URL to serve `devServer.contentBase`. If there was a file `assets/manifest.json`, it would be served at `/serve-content-base-at-this-url/manifest.json`
+
+__webpack.config.js__
+
+```javascript
+module.exports = {
+  //...
+  devServer: {
+    contentBase: path.join(__dirname, 'assets'),
+    contentBasePublicPath: '/serve-content-base-at-this-url'
+  }
+};
+```
+
+
 ## `devServer.disableHostCheck`
 
 `boolean`