Update Marketplace reference (#437)

Update the links to reference
https://marketplace.visualstudio.com/items?itemName=databricks.databricks

Author: lennartkats-db

README.md

@@ -3,7 +3,7 @@
 | System                                                                                          | Status                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
 | ----------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | Build ([main branch](https://github.com/databricks/databricks-vscode/commits/main))             | [![GitHub CI Status](https://github.com/databricks/databricks-vscode/actions/workflows/push.yml/badge.svg?branch=main)](https://github.com/databricks/databricks-vscode/actions/workflows/push.yml) [![Coverage](https://img.shields.io/codecov/c/github/databricks/databricks-vscode/main.svg)](https://codecov.io/gh/databricks/databricks-vscode/branch/main) [![LGTM Grade](https://img.shields.io/lgtm/grade/javascript/github/databricks/databricks-vscode)](https://lgtm.com/projects/g/databricks/databricks-vscode/) |
-| [Marketplace](https://marketplace.visualstudio.com/items?itemName=databricks.databricks-vscode) | [![Marketplace Version](https://img.shields.io/vscode-marketplace/v/databricks.databricks-vscode.svg) ![Marketplace Downloads](https://img.shields.io/vscode-marketplace/d/databricks.databricks-vscode.svg)](https://marketplace.visualstudio.com/items?itemName=databricks.databricks-vscode)                                                                                                                                                                                                                               |
+| [Marketplace](https://marketplace.visualstudio.com/items?itemName=databricks.databricks) | [![Marketplace Version](https://img.shields.io/vscode-marketplace/v/databricks.databricks.svg) ![Marketplace Downloads](https://img.shields.io/vscode-marketplace/d/databricks.databricks.svg)](https://marketplace.visualstudio.com/items?itemName=databricks.databricks)                                                                                                                                                                                                                               |
 
 ## Introduction