Docker Integration docs need updating

[BethMassi]

Fix Docker Integration documentation to properly explain how to configure Docker Compose environments to be published as Docker Compose services, including how to push images to GitHub Container Registry (GHCR). Make sure all the examples in the docs match what exists in the API.

• The .WithProperties example uses properties that do not exist: https://aspire.dev/integrations/compute/docker/#add-docker-compose-environment-resource-with-properties
• Show how to use .AddContainerRegistry syntax to push images to GHCR.
• Explain how the images are pushed to the registry with the aspire do push command.
• Add a link to Aspire.Hosting.Docker API docs

Perhaps a new page should be added for "Pushing Docker Images to GHCR" and the existing page should use a different example for .WithProperties like DashboardEnabled = true;. This new topic could explain how to implement the GitHub Actions workflow to build and push images.