docs: Add documentation for Delighted data warehouse source (#17526)

Co-authored-by: inkeep[bot] <257615677+inkeep[bot]@users.noreply.github.com>

Author: inkeep[bot]

contents/docs/cdp/sources/delighted.md

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+---
+title: Linking Delighted as a source
+sidebar: Docs
+showTitle: true
+availability:
+  free: full
+  selfServe: full
+  enterprise: full
+sourceId: Delighted
+---
+
+<CalloutBox icon="IconInfo" title="Alpha release" type="fyi">
+
+This source is currently in **alpha**. The interface and available tables may change.
+
+</CalloutBox>
+
+The Delighted connector syncs your survey feedback data – responses, people, unsubscribes, bounces, and NPS metrics – into PostHog.
+
+## Adding a data source
+
+1. Go to the [sources tab](https://app.posthog.com/data-management/sources) of the data pipeline section in PostHog.
+2. Click **+ New source** and then click **Link** next to Delighted.
+3. Next, you need an API key from Delighted. In your Delighted account, go to **Settings → API** and copy your API key. Each Delighted project has its own API key with read access to that project's data.
+4. Back in PostHog, enter the key in the `API key` field and click **Next**.
+5. Select the tables you want to sync, set the sync method and frequency, then click **Import**.
+
+Once the syncs are complete, you can start using Delighted data in PostHog.
+
+## Available tables
+
+| Table              | Description                                                   | Sync method  |
+| ------------------ | ------------------------------------------------------------- | ------------ |
+| `survey_responses` | Survey responses with customer feedback, scores, and comments | Incremental  |
+| `people`           | People who have received surveys                              | Incremental  |
+| `unsubscribes`     | People who have unsubscribed from surveys                     | Incremental  |
+| `bounces`          | Email addresses that have bounced                             | Incremental  |
+| `metrics`          | Account-level NPS metrics snapshot (single row)               | Full refresh |
+
+**Incremental** tables sync only new or updated records on each run. **Full refresh** tables reload all data on each sync.
+
+## Configuration
+
+<SourceParameters />