Nest subcategories under their parent categories in the sidebar

[dax (Daniela)]

@Steve_Clark

there doesn’t even seem to be any class added to subcategories that we can manually style with a small indent.

Then utilize the subcategories’ IDs, which are somewhat bothersome but functional:

li.sidebar-section-link-wrapper {
  &[data-category-id="10"], /*subcategory ID*/
  &[data-category-id="11"], /*subcategory ID*/
  &[data-category-id="12"], /*subcategory ID*/
  &[data-category-id="13"]  /*subcategory ID*/ {
    margin-left: 1em;
  }
}