Remove gap between tag and delete button (#1090)

* Remove gap between tag and delete button

* add tag-delete-margin variable

* tab -> spaces

* add tag-delete-margin to docs

docs/documentation/elements/tag.html

@@ -10,6 +10,8 @@ variables:
   value: $text
 - name: $tag-radius
   value: $radius
+- name: $tag-delete-margin
+  value: 1px
 ---
 
 {% capture tag %}