Add simplified docker instructions back into Docker landing page

[JacksonDavenport]

What does this PR do? What is the motivation?

Adds back in a simplified version of the docker run instructions for both linux and windows. The recommended flow is still to use Fleet Automation for all the benefits it gives with building your command. But this gives us some basic barebones steps back in. As well as re-introduced the Windows options as those are not yet supported in Fleet Automation.

Some general cleanup too:

• Previously there were several tabs which are no longer needed here for the install, simplified to Linux + Windows
• Added in container registry section to mirror K8s section
  • Slotted this into the Configuration options for the Datadog Docker Agent section as this felt like the right spot vs adding in another Additional Configurations type of section above
• A lot of general link cleanup

https://datadoghq.atlassian.net/browse/TEEP-3820

Merge instructions

Merge readiness:

• [ ] Ready for merge

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Additional notes

Unprivileged instructions were not added back in. We may want to investigate a dedicated guide page for unprivileged Docker + Kubernetes instructions at different levels of unprivileged access (User, Groups, Read Only Root Filesystems, Capabilities, etc)

[github-actions[bot]]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/jack.davenport/docker-install/containers/docker/

[JacksonDavenport]

Thanks for the review @drichards-87 added those suggestions 👍