fix(docs): add missing closing brace in custom.css for dark theme logo styling

Author: fassko

src/css/custom.css

@@ -623,6 +623,8 @@ div[class^="searchBar_"] div[class*="hitFooter"] a:hover {
 
 [data-theme="dark"] .sidebar-home-flare-logo .menu__link::before {
   background-image: url(/img/ui/home.dark.svg);
+}
+
 /* ============================================================
    Mermaid diagrams
    ============================================================ */