Add documentation of all CSS variables available

docs/documentation/elements/delete.html

@@ -78,3 +78,5 @@ meta:
 </div>
 
 {% include docs/elements/snippet.html content=cross_elements_example %}
+
+{% include docs/components/variables.html %}

docs/documentation/elements/image.html

@@ -21,6 +21,7 @@ meta:
   colors: false
   sizes: false
   variables: true
+  hide_css_vars: true
 ---
 {% capture image %}
 <figure class="image is-128x128">

docs/documentation/elements/table.html

@@ -862,7 +862,3 @@ meta:
 {{- scrollable_table -}}
 {%- endhighlight %}
 {{ simple_scrollable_table_example }}
-{%
-  include docs/components/variables.html
-  type='element'
-%}