Update image references in migration and contract assistance documentation

Author: Vamshi-Microsoft

docs/container_registry_migration.md

@@ -55,7 +55,7 @@ Before you begin, ensure you have the following information:
    - Set the **Full Image name** to the relevant image name and tag:
      - For Web App: `rag-webapp:latest`
 
-   ![Deployment Center](images/deployment_center.png)
+   ![Deployment Center](images/deployment_center_test.png)
 
 5. **Save Changes**:
    - Click **Save** to save the configuration.

docs/contract_assistance.md

@@ -34,7 +34,7 @@ In the admin panel, there is a dropdown to select the Chat With Your Data Contra
 
 - **Default**: Chat With Your Data default prompt.
 
-![UnSelected](images/cwyd_admin_contract_unselected.png)
+![UnSelected](images/cwyd_admin_contract_unselected_test.png)
 
 - **Selected**: Contract Review and Summarization Assistant prompt.