Add table of contents to Overview page

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: kcmartin

src/content/docs/index.mdx

@@ -1,7 +1,6 @@
 ---
 title: Sprites Overview
 description: Persistent, hardware-isolated execution environments for arbitrary code
-tableOfContents: false
 ---
 
 import { LinkCard, CardGrid } from '@/components/react';