feat(perplexity): add perplexity app with send chat prompt action

packages/docs/pages/apps/perplexity/actions.md

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+---
+favicon: /favicons/perplexity.svg
+items:
+  - name: Send chat prompt
+    desc: Generates a model's response for the given chat conversation.
+---
+
+<script setup>
+  import CustomListing from '../../components/CustomListing.vue'
+</script>
+
+<CustomListing />

packages/docs/pages/apps/perplexity/connection.md

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+# Perplexity
+
+1. Go to [API page](https://www.perplexity.ai/settings/api) on Perplexity.
+2. Generate 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 Perplexity integration with Automatisch!