A suggestion for off-line building plus wsl

[OwenBrotherwood]

The biggest addition in this PR is a heads up for the windows 10 method without the use of a VM to obtain a linux type environment to create the code.

The PR got a little bit bigger as I then went thru the page and made the page a bit smaller

For consideration, review and possible merge.

[OwenBrotherwood]

Signed off
Owen Brotherwood

[OwenBrotherwood]

It has to be decided if documentation for VM should be part of the guide: I can easily remove at Lancaster's discretion.
The inclusion of VM's was for a form of completeness that may not be necessary.

[jamesadevine]

I think the inclusion of VMs is fine, but it muddies the installation instructions for those who just want a straightforward-ish process. Perhaps it would be better if it were brought out as a separate section, rather than intermingled with other platforms?

[OwenBrotherwood]

Let us just remove the VM?
The doc I suggest is to remove the repetitions of each step that are per OS: when I first glanced at the procedure, all I saw was a very long doc and I "ran away" ( I returned latter and found that it as "easy").
The doc I present is to show each step in getting hex to micro-bit, with as little repetition as possible.

Edit

https://github.com/lancaster-university/microbit-docs/pull/46/files?diff=split

Edit:

Note: I do not explain how to install the VM or choice of VM as this is out of scope as it is probably hard to maintain