[Documentation] VS Code External Editor

Hello,

I'm so excited that this Add-on exists, I find scripting to be easier to wrap my head around than drag and drop nodes.

In the information given on the Blender Add-on screen, it doesn't specify that a Python Extension needs to be installed for this to work. Having come from writing mostly Javascript, this took me a bit off guard at first but I figured it out.

In the documentation, it only specifies that the main [Python Extension](https://marketplace.visualstudio.com/items?itemName=ms-python.python) is required, however the setting that needs to be changed is added by the [Pylance Extension](https://marketplace.visualstudio.com/items?itemName=ms-python.vscode-pylance). The latter is normally installed by the former, but it doesn't always, such as in cases of network issues, using VS Codium, or other possible scenarios.

I would recommend adding even a small snippet about this in the Documentation, and, if possible, point the user to that via the Add-on Preferences section rather than have differing versions of the same instructions in multiple places.

Cheers.