Update relative paths

Author: IsabelParedes

ui-tests/README.md

@@ -5,11 +5,11 @@ This folder contains the integration tests of the extension.
 They are defined using [Playwright](https://playwright.dev/docs/intro) test runner
 and [Galata](https://github.com/jupyterlab/jupyterlab/tree/master/galata) helper.
 
-The Playwright configuration is defined in [playwright.config.js](../playwright.config.js)
+The Playwright configuration is defined in [playwright.config.js](./playwright.config.js)
 in the root directory.
 
 The JupyterLab server configuration to use for the integration test is defined
-in [jupyter_server_test_config.py](../jupyter_server_test_config.py) in the root directory.
+in [jupyter_server_test_config.py](./jupyter_server_test_config.py) in the root directory.
 
 The default configuration will produce video for failing tests and an HTML report.