feat(themes): add desktopBackground prop to all themes

[tpenguinltg]

This PR partially implements #223. This adds the desktopBackground prop to all my themes and also maps Background to desktopBackground in the Windows theme adapter.

My themes are the low-hanging fruit since the colours are readily available and need little transformation. The themes based on the default Windows themes are next (eventually).

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[arturbien]

@tpenguinltg Thanks for submitting this PR! <3
I think we should add this desktopBackground prop to every theme in one go.
I think for now we can just add a teal color (rgb(84, 170, 170)) to every other theme that's not yours. Can you do that in this PR? 🙌

[tpenguinltg]

@arturbien Many apologies, I thought I had updated this months ago. I added the proper desktop colours for the stock Windows themes and teal for everything else. I also made components like Window use the new theme prop so that it's easy to see the new changes.

[arturbien]

🎉 This PR is included in version 3.9.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[arturbien]

@tpenguinltg great job. backgrounds looking great 🤓 merged and deployed!