Docs: Include deployment steps for Libvirt

[ccamacho]

Closes #61

Description of changes:
This commit adds some initial documentation
for deploying EKS-D on top of a Libvirt host.

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[eks-distro-bot]

Hi @ccamacho. Thanks for your PR.

I'm waiting for a aws member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ccamacho]

@mhausenblas I hope this helps other people testing EKS-D.

[TerryHowe]

/lgtm

[TerryHowe]

/ok-to-test

[TerryHowe]

/approve

[TerryHowe]

/retest

[TerryHowe]

/override docs-presubmit

[TerryHowe]

/test tide

[eks-distro-bot]

@TerryHowe: The specified target(s) for /test were not found.
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[TerryHowe]

/test all

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ccamacho, TerryHowe

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