feat(mistral-ai): add app with create chat completion action

packages/docs/pages/apps/mistral-ai/actions.md

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+---
+favicon: /favicons/mistral-ai.svg
+items:
+  - name: Create chat completion
+    desc: Creates a chat completion.
+---
+
+<script setup>
+  import CustomListing from '../../components/CustomListing.vue'
+</script>
+
+<CustomListing />

packages/docs/pages/apps/mistral-ai/connection.md

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+# Mistral AI
+
+1. Go to [Your API keys page](https://console.mistral.ai/api-keys/) on Mistral AI.
+2. Create a new API key.
+3. Paste the key into the `API Key` field in Automatisch.
+4. Write any screen name to be displayed in Automatisch.
+5. Click `Save`.
+6. Start using Mistral AI integration with Automatisch!