Update the documentaton regarding Windows

[jessica-mitchell]

Removing the Windows logo from the installation pages, as requested from users who deem it a bit deceiving, since no official support is available.
Added text stating to use Windows sub system for Linux (known to work) or the docker container.

[jessica-mitchell]

@pippowell Can you take a look? Pleae comment if you would like to see changes or are ok with this page: https://nest-simulator--3029.org.readthedocs.build/en/3029/installation/user.html#options-for-windows-users

[pippowell]

@jessica-mitchell Looks good and the links work. Might could add the windows logo back but with an exclamation point or similar to indicate that you can technically get NEST to work if you have a Windows machine, but that it won't work out-of-the-box on this OS. Then they might not immediately give up when they don't see the logo and actually try to get WSL working. A user perspective that's less important now, when most people using it are committed to making it work and trying it anyway, but could be helpful later for hooking new users who hear about it and want to try but aren't 100% committed upfront.

[jessica-mitchell]

With @pippowell approval merging this PR