add gdpr section + delete call doc

docusaurus/video/docusaurus/docs/api/gdpr/_category_.json

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+{
+  "label": "GDPR",
+  "position": 7
+}

docusaurus/video/docusaurus/docs/api/gdpr/calls.mdx

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+---
+id: calls
+sidebar_position: 1
+slug: /gdpr/calls
+title: Calls
+---
+
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+
+## Deleting a call
+
+You can either soft-delete or hard-delete a call and all its related data (members, sessions, recordings, transcriptions).
+
+When hard-deleting a call, it is marked as deleted synchronously and then will be completely wiped from our system and its related data asynchronously.
+An ID is returned which allows you to follow the status of the async task.
+
+<Tabs groupId="examples">
+<TabItem value="js" label="JavaScript">
+
+```js
+// soft-delete a call
+const resp = await call.delete({
+  hard: false,
+});
+// resp.call contains call information
+
+// hard-delete a call
+const resp = await call.delete({
+  hard: true,
+});
+// resp.taskID is the ID to be used for following task status
+```
+
+</TabItem>
+<TabItem value="curl" label="cURL">
+
+```bash
+# Soft-delete a call
+curl -X POST "https://video.stream-io-api.com/api/v2/video/call/${CALL_TYPE}/${CALL_ID}/delete?api_key=${API_KEY}" \
+  -H "Authorization: ${TOKEN}" \
+  -H "stream-auth-type: jwt" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "hard": false
+  }'
+
+# Unpin video
+curl -X POST "https://video.stream-io-api.com/api/v2/video/call/${CALL_TYPE}/${CALL_ID}/delete?api_key=${API_KEY}" \
+  -H "Authorization: ${TOKEN}" \
+  -H "stream-auth-type: jwt" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "hard": true
+  }'
+```
+
+</TabItem>
+</Tabs>