docs: add documentation for Anthropic API integration (#3746)

* docs: add documentation for Anthropic API integration

* docs: rename Anthropic documentation to reflect Claude model

Author: Sma1lboy

website/docs/references/models-http-api/anthropic-claude.md

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+# Anthropic Claude
+
+[Anthropic](https://www.anthropic.com/) is an AI research company that develops large language models, including the Claude family of models. While Tabby doesn't natively support Claude's API, you can access Claude models through an OpenAI-compatible API interface using [claude2openai](https://github.com/missuo/claude2openai) as a middleware.
+
+## Chat model
+
+After deploying the claude2openai middleware, you can access all Claude family models through an OpenAI-compatible chat API interface.
+
+```toml title="~/.tabby/config.toml"
+[model.chat.http]
+kind = "openai/chat"
+model_name = "claude-3-sonnet-20240229"
+# Middleware endpoint (adjust host and port according to your deployment)
+api_endpoint = "http://127.0.0.1:6600/v1"
+api_key = "your-api-key"
+```
+
+## Completion model
+
+Anthropic currently does not offer completion-specific API endpoints.
+
+## Embeddings model
+
+Anthropic currently does not provide embedding model APIs.