In reponse to an ask.sagemath question about package installation on windows, I linked to my documentation for a from-source installation on WSL.

Emmanuel Charpentier requested that I added this to the official documentation.

I've added a section on setting up WSL to en/installation/source.rst and a section which covers the steps needed to launch sage in WSL from the windows desktop or start menu to en/installation/launching.rst

CC: @tobiasdiez @EmmanuelCharpentier

Component: documentation

Keywords: WSL

Author: Sandy Scott

Branch/Commit: ec25daf

Reviewer: Tobias Diez

Issue created by migration from https://trac.sagemath.org/ticket/31138