docs: update theme

Author: mrholek

docs/assets/scss/_sidebar.scss

@@ -2,24 +2,24 @@
   --cui-sidebar-bg: var(--cui-tertiary-bg);
   --cui-sidebar-brand-bg: transparent;
   --cui-sidebar-brand-color: var(--cui-body-color);
-  --cui-sidebar-nav-link-color: var(--cui-body-color);
-  --cui-sidebar-nav-link-active-bg: transparent;
-  --cui-sidebar-nav-link-active-color: var(--cui-primary);
-  --cui-sidebar-nav-link-hover-bg: transparent;
-  --cui-sidebar-nav-link-hover-color: var(--cui-primary);
-  --cui-sidebar-nav-group-bg: transparent;
-  --cui-sidebar-nav-group-toggle-show-color: var(--cui-primary);
-
-  .nav-group-items {
-    --cui-sidebar-nav-link-color: var(--cui-body-color);
-  }
 
   .sidebar-nav {
+    --cui-sidebar-nav-link-color: var(--cui-body-color);
+    --cui-sidebar-nav-link-active-bg: transparent;
+    --cui-sidebar-nav-link-active-color: var(--cui-primary);
+    --cui-sidebar-nav-link-hover-bg: transparent;
+    --cui-sidebar-nav-link-hover-color: var(--cui-primary);
     --cui-sidebar-nav-link-icon-margin: 1rem;
-  }
+    --cui-sidebar-nav-group-bg: transparent;
+    --cui-sidebar-nav-group-toggle-show-color: var(--cui-primary);
+
+    .compact .nav-link {
+      --cui-sidebar-nav-link-padding-y: .375rem;
+    }
 
-  .sidebar-nav .compact .nav-link {
-    --cui-sidebar-nav-link-padding-y: .375rem;
+    .nav-group-items {
+      --cui-sidebar-nav-link-color: var(--cui-body-color);
+    }
   }
 }