fix(storybook): brandUrl point to main root (#1586)

Co-authored-by: Szénássy Bence <bence.szenassy@idomsoft.hu>

.storybook/theme.js

@@ -20,6 +20,6 @@ export default create({
 
   brandTitle: '@carbon/vue3',
   brandUrl:
-    'https://github.com/carbon-design-system/carbon-components-vue/tree/main/packages/v3',
+    'https://github.com/carbon-design-system/carbon-components-vue/tree/main',
   brandTarget: '_blank',
 });