Rename .tag to .badge to avoid conflicting with WordPress

docs/_data/nav.yml

@@ -31,6 +31,7 @@
 - title: Components
   pages:
     - title: Alerts
+    - title: Badge
     - title: Breadcrumb
     - title: Buttons
     - title: Button group
@@ -49,7 +50,6 @@
     - title: Popovers
     - title: Progress
     - title: Scrollspy
-    - title: Tag
     - title: Tooltips
 
 - title: Utilities