Consolidate TOC configuration and address code review feedback

Co-authored-by: huangyiirene <7665279+huangyiirene@users.noreply.github.com>

Author: Copilot

apps/site/app/docs/[[...slug]]/page.tsx

@@ -19,21 +19,6 @@ export default async function Page({
       toc={page.data.toc} 
       full={page.data.full}
       lastUpdate={page.data.lastModified}
-      tableOfContent={{
-        enabled: true,
-        footer: (
-          <div className="flex flex-col gap-2 border-t pt-4 mt-4 text-xs">
-            <a
-              href={`https://github.com/objectstack-ai/objectql/blob/main/apps/site/content/docs/${params.slug?.join('/') || 'index'}.mdx`}
-              target="_blank"
-              rel="noopener noreferrer"
-              className="text-muted-foreground hover:text-foreground transition-colors"
-            >
-              Edit this page on GitHub →
-            </a>
-          </div>
-        ),
-      }}
     >
       <DocsTitle>{page.data.title}</DocsTitle>
       <DocsDescription>{page.data.description}</DocsDescription>

apps/site/app/layout.config.tsx

@@ -25,7 +25,18 @@ export const baseOptions: Omit<DocsLayoutProps, 'tree'> = {
   // Enable table of contents
   toc: {
     enabled: true,
-    component: undefined,
+    footer: (
+      <div className="flex flex-col gap-2 border-t pt-4 mt-4 text-xs">
+        <a
+          href="https://github.com/objectstack-ai/objectql/blob/main/apps/site"
+          className="text-muted-foreground hover:text-foreground transition-colors inline-flex items-center gap-1"
+          target="_blank"
+          rel="noopener noreferrer"
+        >
+          Edit this page on GitHub →
+        </a>
+      </div>
+    ),
   },
   // Enable last updated timestamp
   lastUpdate: {