docs: curate ecosystem renderers on main page

- Remove community React renderers (covered in ecosystem page)
- Add Vercel json-render as top ecosystem highlight
- Keep Android and React Native community renderers

Author: Zaf

docs/renderers.md

@@ -23,12 +23,11 @@ Check the [Roadmap](roadmap.md) for more.
 
 ## Ecosystem Renderers
 
-The community is building A2UI renderers for platforms not yet officially supported. Top community projects:
+The community is building A2UI renderers for additional platforms:
 
-- **[@a2ui-sdk/react](https://github.com/easyops-cn/a2ui-sdk)** — React renderer with Radix UI + Tailwind (~20 ⭐, v0.8, [npm](https://www.npmjs.com/package/@a2ui-sdk/react))
-- **[A2UI-Android](https://github.com/lmee/A2UI-Android)** — Jetpack Compose renderer, 20+ components (~15 ⭐, v0.8)
+- **[json-render](https://json-render.dev/docs/a2ui)** — Vercel's React library for rendering A2UI catalogs via Zod schemas ([comparison](https://dipjyotimetia.medium.com/vercels-json-render-vs-google-s-a2ui-the-head-to-head-6f213cf1a23b))
+- **[A2UI-Android](https://github.com/lmee/A2UI-Android)** — Community Jetpack Compose renderer, 20+ components (~15 ⭐, v0.8)
 - **[a2ui-react-native](https://github.com/sivamrudram-eng/a2ui-react-native)** — React Native renderer for iOS/Android (~9 ⭐, v0.8)
-- **[@zhama/a2ui](https://www.npmjs.com/package/@zhama/a2ui)** — React implementation with markdown support (v0.8, [npm](https://www.npmjs.com/package/@zhama/a2ui))
 
 See the **[full ecosystem renderers list](ecosystem/renderers.md)** for more community projects and how to submit your own.