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

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

@@ -0,0 +1,12 @@
+---
+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 />