docs(breadcrumb): add link to github (#1414)

Author: atinux

docs/content/2.components/breadcrumb.md

@@ -1,6 +1,10 @@
 ---
 title: Breadcrumb
 description: A list of links that indicate the current page's location within a navigational hierarchy.
+links:
+  - label: GitHub
+    icon: i-simple-icons-github
+    to: https://github.com/nuxt/ui/blob/dev/src/runtime/components/navigation/Breadcrumb.vue
 ---
 
 ## Usage