docs: add documentation to main repository

docs/llm-providers/overview.mdx

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+---
+title: "Overview"
+description: "Configure your AI model for Strix"
+---
+
+Strix uses [LiteLLM](https://docs.litellm.ai/docs/providers) for model compatibility, supporting 100+ LLM providers.
+
+## Recommended Models
+
+For best results, use one of these models:
+
+| Model             | Provider      | Configuration                    |
+| ----------------- | ------------- | -------------------------------- |
+| GPT-5             | OpenAI        | `openai/gpt-5`                   |
+| Claude 4.5 Sonnet | Anthropic     | `anthropic/claude-sonnet-4-5`    |
+| Gemini 3 Pro      | Google Vertex | `vertex_ai/gemini-3-pro-preview` |
+
+## Quick Setup
+
+```bash
+export STRIX_LLM="openai/gpt-5"
+export LLM_API_KEY="your-api-key"
+```
+
+## Provider Guides
+
+<CardGroup cols={2}>
+  <Card title="OpenAI" href="/llm-providers/openai">
+    GPT-5 and Codex models.
+  </Card>
+  <Card title="Anthropic" href="/llm-providers/anthropic">
+    Claude 4.5 Sonnet, Opus, and Haiku.
+  </Card>
+  <Card title="OpenRouter" href="/llm-providers/openrouter">
+    Access 100+ models through a single API.
+  </Card>
+  <Card title="Google Vertex AI" href="/llm-providers/vertex">
+    Gemini 3 models via Google Cloud.
+  </Card>
+  <Card title="AWS Bedrock" href="/llm-providers/bedrock">
+    Claude 4.5 and Titan models via AWS.
+  </Card>
+  <Card title="Azure OpenAI" href="/llm-providers/azure">
+    GPT-5 via Azure.
+  </Card>
+  <Card title="Local Models" href="/llm-providers/local">
+    Llama 4, Mistral, and self-hosted models.
+  </Card>
+</CardGroup>
+
+## Model Format
+
+Use LiteLLM's `provider/model-name` format:
+
+```
+openai/gpt-5
+anthropic/claude-sonnet-4-5
+vertex_ai/gemini-3-pro-preview
+bedrock/anthropic.claude-4-5-sonnet-20251022-v1:0
+ollama/llama4
+```