docs: migrate index.md to index.mdx

docs/index.mdx

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+---
+title: Perstack Documentation
+description: A harness for micro-agents — build practical agentic apps that are cheaper and easier to operate.
+slug: docs
+pagefind: true
+---
+
+import { LinkCard, CardGrid } from '@astrojs/starlight/components';
+
+Perstack is a harness for micro-agents. 
+
+## Explore the Docs
+
+### Learn
+
+- [**Getting Started**](/docs/getting-started/walkthrough/) — create your first expert and walk through the core workflow
+- [**Concepts**](/docs/understanding-perstack/concept/) — understand the architecture behind experts, runtime, isolation, and the boundary model
+
+### Build
+
+- [**Making Experts**](/docs/making-experts/best-practices/) — defining experts with skills, delegation, testing, and best practices
+- [**Guides**](/docs/guides/rapid-prototyping/) — task-oriented walkthroughs from rapid prototyping to production deployment
+
+### Operate
+
+- [**Deployment**](/docs/operating-experts/deployment/) — container images, serverless integration, and `perstack install`
+- [**Isolation & Security**](/docs/operating-experts/isolation-by-design/) — sandbox design, workspace boundaries, and secret management
+
+### Reference
+
+- [**CLI Reference**](/docs/references/cli/) — all commands and options for the Perstack CLI
+- [**perstack.toml Reference**](/docs/references/perstack-toml/) — complete configuration specification
+- [**Providers and Models**](/docs/references/providers-and-models/) — supported providers and model configuration
+
+## Community
+
+- [GitHub](https://github.com/perstack-ai/perstack) — source code and issues
+- [Discord](https://discord.gg/2xZzrxC9) — chat with the community
+- [@FL4T_LiN3 on X](https://x.com/FL4T_LiN3) — updates and announcements