docs: Add Mistral Vibe to agents list (#328)

Author: SecxiDatker

docs/overview/agents.mdx

@@ -16,6 +16,7 @@ The following agents can be used with an ACP Client:
 - [JetBrains Junie _(coming soon)_](https://www.jetbrains.com/junie/)
 - [Kimi CLI](https://github.com/MoonshotAI/kimi-cli)
 - [LLMling-Agent](https://phil65.github.io/llmling-agent/advanced/acp_integration/)
+- [Mistral Vibe](https://github.com/mistralai/mistral-vibe)
 - [OpenCode](https://github.com/sst/opencode)
 - [OpenHands](https://docs.openhands.dev/openhands/usage/run-openhands/acp)
 - [Stakpak](https://github.com/stakpak/agent?tab=readme-ov-file#agent-client-protocol-acp)