feat(CNavGroup): add compact variant

Author: mrholek

src/components/nav/CNavGroup.ts

@@ -3,6 +3,10 @@ import { defineComponent, h, onMounted, onUpdated, ref, RendererElement, Transit
 const CNavGroup = defineComponent({
   name: 'CNavGroup',
   props: {
+    /**
+     * Make nav group more compact by cutting all `padding` in half.
+     */
+    compact: Boolean,
     /**
      * Show nav group items.
      */
@@ -109,7 +113,12 @@ const CNavGroup = defineComponent({
                 h(
                   'ul',
                   {
-                    class: 'nav-group-items',
+                    class: [
+                      'nav-group-items',
+                      {
+                        compact: props.compact,
+                      },
+                    ],
                   },
                   slots.default &&
                     slots.default().map((vnode, index) =>