removed reference to environmental variables

examples/streamlit/README.md

@@ -6,8 +6,6 @@ The extra wheels of the package `blinker`is required (can't be found on Pypi).
 
 [Here](https://stackoverflow.com/questions/69352179/package-streamlit-app-and-run-executable-on-windows/69621578#69621578) you can find additional information on why the `src/run_app.py` has the chosen structure.
 
-To properly run the app once installed, the environmental variable `WORKING_DIR` has to be set to the installation path on the Windows machine: `<installation-folder>/pkgs`.
-
 The browser tab with the app should open automatically after a brief delay. This is done to avoid the tab opening while streamlit is still starting, so that this results in a `Cannot reach localhost:8501` error.