tweak cms configs to be more robust/appropriate for blog collection

themes/hugo-xmin/static/admin/desktop/config.yml

@@ -30,6 +30,8 @@ collections:
         label: Categories
         widget: list
         allow_add: false
+        allow_delete: false
+        collapsed: true
         default:
           - 'blog'
         fields:

themes/hugo-xmin/static/admin/mobile/config.yml

@@ -34,9 +34,6 @@ collections:
       - label: "Tags"
         name: "tags"
         widget: "list"
-        fields: 
-          - label: "Tag"
-            name: "tag"
-            widget: "string"
+        allow_add: true
         required: true
       - {label: "Body", name: "body", widget: "markdown", required: true}