Hide embedded TOC as soon as the sidebar TOC appears

Before: .toc.sidebar was revealed at lg (1024px) but .toc.embedded
only hid at xl (1280px), so the 1024-1279px window and wide Safari
windows on slightly-narrower-than-full-screen layouts showed both
TOCs at once (once inline at the top of the article, once as the
right-hand sidebar).

Switch .toc.embedded to lg:hidden so the embedded copy disappears the
moment the sidebar is available. On screens below 1024px the embedded
TOC keeps acting as the mobile fallback, the sidebar stays hidden.

Author: wintermeyer

ui-bundle/src/css/site.css

@@ -529,7 +529,7 @@ main.article > .content {
 }
 
 .toc.embedded {
-  @apply mb-8 border border-neutral-200 bg-neutral-100/60 p-4 xl:hidden dark:border-neutral-800 dark:bg-neutral-900/60;
+  @apply mb-8 border border-neutral-200 bg-neutral-100/60 p-4 lg:hidden dark:border-neutral-800 dark:bg-neutral-900/60;
 }
 
 /* ---------------------------------------------------------------------------