Trac #30484: Document using Sage on Windows via Visual Studio Code with WSL remote

We already have a basic VS Code configuration; #33103 makes some minor
updates.

In this ticket, we add documentation for installing VS Code on Windows
and setting up the WSL remote, as the primary way how to use Sage on
Windows. This goes to
- https://doc.sagemath.org/html/en/installation/launching.html

Next task: cross reference it from the developer's guide and add
information there on how to develop Sage on Windows.

References:
- Pylance: https://marketplace.visualstudio.com/items?itemName=ms-python
.vscode-pylance  (includes pyright)

URL: https://trac.sagemath.org/30484
Reported by: mkoeppe
Ticket author(s): Louis Ng, Matthias Koeppe
Reviewer(s): Tobias Diez, Kwankyu Lee

Author: Release Manager

src/doc/en/installation/launching.rst

@@ -234,3 +234,28 @@ You can check the presence of some of these packages using the command
    following code in the notebook::
 
      plot3d(lambda u,v:(u^2+v^2)/4-2,(-2,2),(-2,2)).show(viewer="jmol")
+
+Using Jupyter notebook through Visual Studio Code (VS Code) in WSL
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+If you have installed Sage on Windows using Windows Subsystem for
+Linux (WSL), it is convenient to use Visual Studio Code (VS Code)
+to interact with Sage.
+
+Here are steps to use SageMath in a Jupyter notebook in VS Code:
+
+* Install and run `VS Code <https://code.visualstudio.com/download>`_
+  in Windows.
+
+* Click the "Extension" icon on the left (or press :kbd:`Ctrl` +
+  :kbd:`Shift` + :kbd:`X`) to open a list of extensions. Install the
+  "Remote - WSL" and "Jupyter" extensions.
+
+* In the command palette (:kbd:`Ctrl` + :kbd:`Shift` + :kbd:`P`),
+  enter "Remote-WSL: New Window", and hit :kbd:`Enter`.
+
+* In the command palette, enter "Create: New Jupyter Notebook", and
+  hit :kbd:`Enter`.
+
+* Click "Select Kernel" on the right (or press :kbd:`Ctrl` +
+  :kbd:`Alt` + :kbd:`Enter`), select SageMath, and hit :kbd:`Enter`.