fix(theme): dropdown menu partially hidden by the homepage footer when it is too long (#2904)

Author: zonemeen

src/client/theme-default/styles/vars.css

@@ -256,12 +256,12 @@
  * -------------------------------------------------------------------------- */
 
 :root {
-  --vp-z-index-local-nav: 10;
-  --vp-z-index-nav: 20;
-  --vp-z-index-layout-top: 30;
-  --vp-z-index-backdrop: 40;
-  --vp-z-index-sidebar: 50;
-  --vp-z-index-footer: 60;
+  --vp-z-index-footer: 10;
+  --vp-z-index-local-nav: 20;
+  --vp-z-index-nav: 30;
+  --vp-z-index-layout-top: 40;
+  --vp-z-index-backdrop: 50;
+  --vp-z-index-sidebar: 60;
 }
 
 /**