Add cross-platform getting started guide to TOC for Microsoft DSC

[Gijsreyn]

PR Summary

This change adds an entry in the v1.1 toc.yml pointing to Microsoft DSC, and fixes #310

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• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
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[learn-build-service-prod]

Learn Build status updates of commit 7dac46c:

✅ Validation status: passed

File	Status	Preview URL	Details
dsc/docs-conceptual/dsc-1.1/toc.yml	✅Succeeded	View (dsc-1.1)

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[michaeltlombardi]

I think this is a good idea eventually, but right now I think it would be a little misleading - the examples in the v3 getting started guide are currently Windows-centric, because we don't have a good cross-platform resource for examples, like a File resource.

[michaeltlombardi]

Closing this for now, may reopen / re-address when we have cross-platform content for the getting started guide.