Add Outline connector documentation with API key setup instructions

connectors/outline.mdx

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+---
+title: Outline Connector
+description: "Access knowledge from your Outline workspace"
+---
+
+## How it works
+
+The Outline connector indexes documents and collections from your Outline workspace.
+
+## Setting up
+
+### Authorization
+
+1. Login to your Outline workspace
+2. Navigate to **Preferences → API & Apps**
+
+![OutlineConnectorAuth](/images/connectors/outline/outline_1.png)
+
+3. Click **New API Key...** to generate a new API key
+4. Provide a name for your API key and set any desired scope limitations or expiration date
+   - If creating a scoped API key, ensure you include `collections.list` and `documents.list` permissions
+
+![OutlineConnectorAuth](/images/connectors/outline/outline_2.png)
+
+5. Copy the generated API key - you'll need this along with your workspace's base URL to authorize your Onyx connector
+
+### Indexing
+
+1. Navigate to the Admin Dashboard.
+2. In the sidebar select **Add Connector** and click on the **Outline** tile.
+3. Select **Create New** and then provide your **Base URL** and **API Key**, along with an optional name for your credentials.
+   - **Base URL**: Your Outline workspace URL (e.g., `https://yourcompany.getoutline.com`)
+   - **API Key**: The API key you generated in the previous steps
+4. Click **Create** and your credentials will be saved and automatically selected.
+5. After selecting **Continue** you can choose a name for your connector and then click **Create Connector**.
+6. Once you have created your connector Onyx will automatically begin indexing your documents and collections.