doc: Do not override assets while building the styleguide

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

src/components/NcAvatar/NcAvatar.vue

@@ -14,7 +14,7 @@
 ### Avatar with image
 
 ```vue
-	<NcAvatar url="https://nextcloud.com/wp-content/themes/next/assets/img/common/nextcloud-square-logo.png" />
+	<NcAvatar url="favicon-touch.png" />
 ```
 
 ### Avatar with material design icon

styleguide.config.js

@@ -32,6 +32,10 @@ module.exports = async () => {
 			path.join(__dirname, 'styleguide/assets/additional.css'),
 			path.join(__dirname, 'styleguide/assets/styleguide.css'),
 		],
+
+		assetsDir: path.join(__dirname, 'styleguide/assets/img'),
+		styleguideDir: 'styleguide/build',
+
 		pagePerSection: true,
 		minimize: true,
 		verbose: false,