docs(placetel): Add connection and triggers pages

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

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+# Placetel
+
+1. Go to [AppStore page](https://web.placetel.de/integrations) on Placetel.
+2. Search for `Web API` and click to `Jetzt buchen`.
+3. Click to `Neuen API-Token erstellen` button and copy the API Token.
+4. Paste the copied API Token into the `API Token` field in Automatisch.
+5. Now, you can start using Placetel integration with Automatisch!

packages/docs/pages/apps/placetel/triggers.md

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+---
+favicon: /favicons/placetel.svg
+items:
+  - name: Hungup call
+    desc: Triggers when a call is hungup.
+---
+
+<script setup>
+  import CustomListing from '../../components/CustomListing.vue'
+</script>
+
+<CustomListing />