docs: Add actions and connection pages for DeepL

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

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+---
+favicon: /favicons/deepl.svg
+items:
+  - name: Translate Text
+    desc: Translates text from one language to another.
+---
+
+<script setup>
+  import CustomListing from '../../components/CustomListing.vue'
+</script>
+
+<CustomListing />

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

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+# DeepL
+
+1. Go to [your account page](https://www.deepl.com/account/summary) on DeepL.
+2. Scroll down and copy `Authentication Key for DeepL API`.
+3. Paste the key into the `Authentication Key` field in Automatisch.
+4. Write any screen name to be displayed in Automatisch.
+5. Click `Save`.
+6. Start using DeepL integration with Automatisch!