New docs for Placement Groups service

[Vernholio]

Several updates to include documentation for the new Placement Groups service:

Added

• Work with Placement Groups (products/compute/compute-instances/guides/placement-groups/index.md). New document added that covers the use of this service.
• API v4.177.0 Release Notes. New API release to include Placement Groups and Object Storage updates.

Changed

Updated several product guides to include support and information for placement groups.

• Compute Instances (products/compute/compute-instances/_index.md)
• Guides (products/compute/compute-instances/guides/index.md)
• Cloning a Compute Instance (products/compute/compute-instances/guides/clone-instance/index.md)
• Copy a Disk to a Different Account (products/compute/compute-instances/guides/copy-a-disk-to-a-different-account/index.md)
• Create a Compute Instance (products/compute/compute-instances/guides/create/index.md)
• Migrate to a Different Data Center (products/compute/compute-instances/guides/migrate-to-a-different-dc/index.md)
• Resize a Linode (products/compute/compute-instances/guides/resize/index.md)

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[Vernholio]

Broken links: Links are included in some topics to documents that will be published when this PR is merged.