add theme color back

docs/index.html

@@ -86,7 +86,8 @@
           noData: 'No Results',
           depth: 3,
           namespace: 'shoelace-docs'
-        }
+        },
+        themeColor: 'rgb(var(--sl-color-primary-600))'
       };
     </script>
     <script src="https://cdn.jsdelivr.net/npm/docsify@4/lib/docsify.min.js"></script>